Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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