APA

Baer E. E., . (1972). Salesmanship. New York: McGraw-Hill.

Chicago

Baer Earl E, . 1972. Salesmanship. New York: McGraw-Hill.

Harvard

Baer E. E., . (1972). Salesmanship. New York: McGraw-Hill.

MLA

Baer Earl E, . Salesmanship. New York: McGraw-Hill. 1972.