This is one of the best monolingual learner’s dictionary of English. A learner’s dictionary gives special help with the things language learners need—irregular forms, dependent prepositions, formal/informal language, particular grammar, etc.

Bilingual Dictionary

Use a monolingual dictionary to understand how to use new vocabulary (for example when you want to write). Use a bilingual dictionary when you need to quickly check the meaning of a specific term.

IL RAGAZZINI 2016, Dizionario Inglese-Italiano, Italian-English, Zanichelli (print version)

http://www.zanichelli.it/ricerca/prodotti/il-ragazzini-ragazzini

https://www.amazon.it/Ragazzini-Dizionario-inglese-italiano-italiano-inglese-aggiornamento/dp/8808437159

online dictionaries

http://context.reverso.net/traduzione/italiano-inglese/fornire very good!

http://context.reverso.net/traduzione/inglese-italiano/provide

Word Reference

http://www.wordreference.com/

http://www.wordreference.com/enit/diplomat

Corriera della Sera

ttp://dizionari.corriere.it/dizionario_inglese/index.shtml

https://dizionari.corriere.it/dizionario_inglese/Inglese/D/diplomacy.shtml

http://dizionari.corriere.it/dizionario_inglese/Italiano/C/concorso_1.shtml

https://dizionari.corriere.it/index.shtml?refresh_ce

Reverso Dictionary

http://dictionary.reverso.net/italian-english/

Glosbe Dictionary

https://glosbe.com/en/it/

https://glosbe.com/en/it/truce

Other dictionaries

http://dictionary.cambridge.org/

http://dictionary.cambridge.org/dictionary/british/italian_1

https://dictionary.cambridge.org/dictionary/italian-english/principio
http://www.stars21.com/dictionary/English-Italian_dictionary.html

https://www.stars21.com/dictionary/italian/
Diplomacy Dictionary

Dizionario di diplomazia e relazioni internazionali-

Dictionary of diplomacy and international relations.

inglese-italiano, english-italian dictionary

Buri M. Rosaria, Editore Argo, collana Quaderni Isufi, currently out of print, but maybe on Amazon or from IR students selling their books or in a library. Here are 2 possibilities:

https://www.amazon.it/s?k=Dizionario+di+diplomazia+e+relazioni+internazionali-Dictionary+of+diplomacy+and+international+relations.+Inglese-italiano%2C+english-italian&i=stripbooks&__mk_it_IT=%C3%85M%C3%85%C5%BD%C3%95%C3%91&ref=nb_sb_noss

https://www.ibs.it/dizionario-di-diplomazia-relazioni-internazionali-libro-m-rosaria-buri/e/9788882343514#

http://www.ibs.it/code/9788882343514/buri-m--rosaria/dizionario-diplomazia-relazioni.html
British National Corpus
http://www.natcorp.ox.ac.uk/
A corpus is the raw material of dictionaries. Look up any word or expression to see examples of how it combines with other words in native-speaker English.

http://phrasesinenglish.org/searchBNC.html

example 'ceasefire'

http://phrasesinenglish.org/searchBNC.php

example 'deal with'

http://phrasesinenglish.org/searchBNC.php

Grammar Exercise Books
Essential Grammar in Use – Raymond Murphy, Cambridge University Press
English Grammar in Use – Raymond Murphy, Cambridge University Press

Advanced Grammar in Use – Martin Hewings, Cambridge University Press

Grammar Reference Book
Practical English Usage – Michael Swan, Oxford University Press

Writing Essays

Writing Academic English by Alice Oshima and Ann Hogue, publisher Longman

Sites where you can study English

Here is a site where you can check and practice grammar structures:http://www.ego4u.com/en/cram-up/grammar
(from here you can also access reading and other resources)
There is also:

http://www.vivquarry.com/wkshts/grammar.html

http://vivquarry.com/wkshts/
e.g. http://vivquarry.com/wkshts/linkwd2.html
and http://esl.about.com/od/writingadvanced/a/wc_addition.htm
but the best sites are:

Exam English ✓Free Practice Tests for learners of English

http://examenglish.com/cambridge_esol.php
for lots of free practice material at different levels (about this more later)

for example:

https://www.examenglish.com/IELTS/IELTS_general_reading1.htm

and BBC Learning English
http://www.bbc.co.uk/learningenglish new address
and http://www.bbc.co.uk/worldservice/learningenglish/general/ old address (but still active)
you should explore the site. For example:

http://www.bbc.co.uk/learningenglish/english/features/6-minute-english

http://www.bbc.co.uk/worldservice/learningenglish/general/sixminute/

is for listening practice and dictation http://www.bbc.co.uk/worldservice/learningenglish/language/

is for grammar, vocabulary and pronunciation

Other sites where you can practice English

iTunes U (via iTunes , which you must install)http://www.apple.com/it/education/itunes-u/
for video and audio podcasts of university lectures and courses and to see how your subject is taught in English.

TED (Technology, Entertainment, Design)
http://www.ted.com/
Fantastic presentations from some of the most innovative people in the world. Watching presentations is a really good way to practice comprehension.

The Purdue Online Writing Lab

http://owl.english.purdue.edu/

Online distance courses (MOOCs – Massive open online course)

http://en.wikipedia.org/wiki/Massive_open_online_course

http://mooc.org/
http://www.moocs.co/
http://www.mooc-list.com/

TV Channels

The aim here is to listen and improve your comprehension, stay up to date (so you should also follow the telegiornale in Italian) and absorb some of the language.

BBC

http://www.bbc.co.uk/

France 24 in English

http://www.france24.com/en/

Aljazeera in English

http://www.aljazeera.com/

You can also get a wide range of live TV channels and old TV programs and films on:

https://www.popcornflix.com/pages/discover/d/tv-shows

https://123movies.gallery/

https://www.tvnz.co.nz/livetv

https://www.snagfilms.com/categories

A little light translation!

Don’t forget, if you need to expand your knowledge of basic vocabulary, go to the EU site where you will find the 2018 EU General Report (154 pages). If clicking on a link here doesn't work or is very slow, just copy and paste the link onto Google search.

https://publications.europa.eu/it/publication-detail/-/publication/292fd37c-30d8-11e9-8d04-01aa75ed71a1/language-it/format-PDF/source-103848005

then download the pdf format in both Italian and English

file:///D:/Downloads/NAAD19001ENN.en.pdf

file:///D:/Downloads/NAAD19001ITN.it.pdf

This will give you more than 150 pages of Italian to translate into English! To check your translation just move between the Italian and English version and take notes on regular language usage and differences. You can also download the French, Spanish or German versions.

And here's the 2017 General Report (130 pages)

https://publications.europa.eu/it/publication-detail/-/publication/4d16193a-25a7-11e8-ac73-01aa75ed71a1/language-it/format-PDF/source-103848083

file:///D:/Downloads/NAAD18001ITN.it%20(1).pdf

file:///D:/Downloads/NAAD18001ENN.en%20(3).pdf

And here's the 2016 General Report (104 pages)

https://publications.europa.eu/it/publication-detail/-/publication/99c8732c-094a-11e7-8a35-01aa75ed71a1/language-en

file:///D:/Downloads/NAAD17001ITN.it.pdf

file:///D:/Downloads/NAAD17001ENN.en.pdf

You can also get the General Reports for 2015 (96 pages) and 2014 (288 pages!)

https://publications.europa.eu/en/publication-detail/-/publication/db649a28-e42e-11e5-8a50-01aa75ed71a1/language-en/format-PDF/source-75768461

https://publications.europa.eu/en/publication-detail/-/publication/beafd525-4bc8-468c-9342-69041fb04e0f/language-en

If you prefer, you can go straight to the English version of the 2018 EU General Report or other texts on the EU site or UN site and simply start taking notes on common expressions used in diplomatic English. See my future post about the UN website for a little more information about how to get documents.