Dyfyniad APA

Stephenson, J. (1979). Principles and Practice of Commercial Correspondance (3rd ed.). wheeler.

Dyfyniad Arddull Chicago

Stephenson, James. Principles and Practice of Commercial Correspondance. 3rd ed. Allahabad: wheeler, 1979.

Dyfyniad MLA

Stephenson, James. Principles and Practice of Commercial Correspondance. 3rd ed. wheeler, 1979.

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