APA

Schlain B. H., . (1966). The professional approach to modern salesmanship. New York: McGraw-Hill.

Chicago

Schlain Bert H, . 1966. The professional approach to modern salesmanship. New York: McGraw-Hill.

Harvard

Schlain B. H., . (1966). The professional approach to modern salesmanship. New York: McGraw-Hill.

MLA

Schlain Bert H, . The professional approach to modern salesmanship. New York: McGraw-Hill. 1966.