Cita APA (7a ed.)

Hartman, G. (1947). Machines and the men who made the world of industry. MacMillan.

Cita Chicago Style (17a ed.)

Hartman, Gertrude. Machines and the Men Who Made the World of Industry. New York: MacMillan, 1947.

Cita MLA (9a ed.)

Hartman, Gertrude. Machines and the Men Who Made the World of Industry. MacMillan, 1947.