APA (7th ed.) Citation

John, R. (1983). Basic letter writing in English. Collins ELT.

Chicago Style (17th ed.) Citation

John, Roland. Basic Letter Writing in English. London: Collins ELT, 1983.

MLA (9th ed.) Citation

John, Roland. Basic Letter Writing in English. Collins ELT, 1983.

Warning: These citations may not always be 100% accurate.