Cita APA (7th ed.)

Gartside , L. (1992). Model business letters (ELBS) (4th.). Pitman.

Cita Chicago (17th ed.)

Gartside , L. Model Business Letters (ELBS). 4th. London: Pitman, 1992.

Cita MLA (9th ed.)

Gartside , L. Model Business Letters (ELBS). 4th. Pitman, 1992.