Dyfyniad APA

(1978). Textbook Of Salesmanship/russell,a Frederic. McGraw-Hill.

Dyfyniad Arddull Chicago

Textbook Of Salesmanship/russell,a Frederic. McGraw-Hill, 1978.

Dyfyniad MLA

Textbook Of Salesmanship/russell,a Frederic. McGraw-Hill, 1978.

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