Dyfyniad APA

Russel, F. A., & Beach, F. H. Test book of salesmanship (6th ed.). McGraw Hill bok company.

Dyfyniad Arddull Chicago

Russel, Fredrick A., and Frank H. Beach. Test Book of Salesmanship. 6th ed. New York: McGraw Hill bok company.

Dyfyniad MLA

Russel, Fredrick A., and Frank H. Beach. Test Book of Salesmanship. 6th ed. McGraw Hill bok company.

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