APA (7e ed.) Bronvermelding

Proctor, W. M. (1929). Vocations: The world's work and its workers. Houghton Mifflin Company.

Chicago (17e ed.) Bronvermelding

Proctor, William Martin. Vocations: The World's Work and Its Workers. Boston : New York [etc.]: Houghton Mifflin Company, 1929.

MLA (8e ed.) Bronvermelding

Proctor, William Martin. Vocations: The World's Work and Its Workers. Houghton Mifflin Company, 1929.