Gaya APA

Buskirk, F, A, R, F, H, B, R, H. (1978). Textbook of Salesmanship (9). United States of America: Mc-Graw-Hill.

Gaya MLA

Buskirk, Frederic, A., Russell., Frank, H., Beach., Richard, H.. "Textbook of Salesmanship". 9 United States of America: Mc-Graw-Hill, 1978. Text.