Cita APA (7a ed.)

Gordon, I. (1982). Basic business letters (1st published, repr. 1982.). Heinemann Educational.

Cita Chicago Style (17a ed.)

Gordon, Ian. Basic Business Letters. 1st published, repr. 1982. London: Heinemann Educational, 1982.

Cita MLA (9a ed.)

Gordon, Ian. Basic Business Letters. 1st published, repr. 1982. Heinemann Educational, 1982.