Παραπομπή APA

Wheeler, E. (1961). Tested selling tips from around the world. Prentice Hall.

Παραπομπή Chicago Style

Wheeler, Elmer. Tested Selling Tips from Around the World. New Jersey: Prentice Hall, 1961.

Παραπομπή MLA

Wheeler, Elmer. Tested Selling Tips from Around the World. Prentice Hall, 1961.