APA استشهاد

Fry, R., & Hume, G. B. (1967). Manual of Commercial Correspondence. Issac Pitman.

استشهاد بنمط شيكاغو

Fry, Roland, و G Bayley Hume. Manual of Commercial Correspondence. London: Issac Pitman, 1967.

MLA استشهاد

Fry, Roland, و G Bayley Hume. Manual of Commercial Correspondence. Issac Pitman, 1967.