Gaya APA

Dorogikh, R, V., Teplova, L, I. (2017). E-book How to Write Formal Letters : Study Guide for Students of English . Russia: Lomonosov Moscow State University.

Gaya MLA

Dorogikh, Raisa, V.., Teplova, Liubov, I.. "E-book How to Write Formal Letters : Study Guide for Students of English". Russia: Lomonosov Moscow State University, 2017. Text.