Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.