Citazione APA

Proctor, W. M. (1933). Vocations: The world's work and its workers (Rev. and enl. ed.). Houghton Mifflin Company.

Stile di citazione Chicago

Proctor, William Martin. Vocations: The World's Work and Its Workers. Rev. and enl. ed. Boston : New York [etc.]: Houghton Mifflin Company, 1933.

Citazione MLA

Proctor, William Martin. Vocations: The World's Work and Its Workers. Rev. and enl. ed. Houghton Mifflin Company, 1933.