Citazione APA

Canfield, B. R. (1958). Salesmanship; Practice and Problems (3rd ed.). McGraw-Hill.

Stile di citazione Chicago

Canfield, Bertrand R. Salesmanship; Practice and Problems. 3rd ed. New York: McGraw-Hill, 1958.

Citazione MLA

Canfield, Bertrand R. Salesmanship; Practice and Problems. 3rd ed. McGraw-Hill, 1958.