1. Communicating across Cultures by Bob Dignen,Cambridge

2. Technium Social Science Journal vol. 14, 2020

https://techniumscience.com/

3. Popova A.G. (2011) “Speech etiquette and originality of speech. Speech etiquette: the subtleties of the culture of communication. Basic rules of speech etiquette: Speech etiquette in modern Russian”. Novosibirsk Siberian State Geodetic Academy (SSGA). Retrieved on 22nd October, 2020

https://pedtext.ru/en/wall/rechevoi-etiket-i-svoeobrazie-rechi-rechevoi-etiket-tonkosti/

4. Ryan, M. (2020) “What’s the difference between etiquette and manners?”. Manners Adviser: Tips for Adults. Retrieved on 6th, October, 2020

https://mannersadvisor.com/whats-the-difference-between-etiquette-and-manners/

6. Business Vocabulary in Use: Advanced by bill Muscull

7. UNESCO Universal Declaration on Cultural Diversity, adopted by the 31st session of the General Conference of UNESCO, Paris, 2 November 2001

https://unesdoc.unesco.org/images/0012/001271/127160pdf

8. Английский язык: межкультурная коммуникация. Практикум, Электронный учебно-методический комплекс, 2008

https://www.bsuir.by/m/12_100229_1_139584.pdf

9. https://www.bbc.com/news/technology-61416757

10. https://www.flowrite.com/blog/formal-email#formal-email-format

https://www.flowrite.com/blog/email-etiquette-rules-tips