Dyfyniad APA

Russell, F., & Beach, F. H. B. (1988). Selling; Principles and Practices (12th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Russell, Frederic, and Frank H Buskirk Beach. Selling; Principles and Practices. 12th ed. New York: McGraw-Hill, 1988.

Dyfyniad MLA

Russell, Frederic, and Frank H Buskirk Beach. Selling; Principles and Practices. 12th ed. McGraw-Hill, 1988.

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