Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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