Cita APA (7th ed.)

Schultz, T. W. (1981). Investing in people: The economics of population quality. University of California.

Cita Chicago (17th ed.)

Schultz, Theodore W. Investing in People: The Economics of Population Quality. London: University of California, 1981.

Cita MLA (9th ed.)

Schultz, Theodore W. Investing in People: The Economics of Population Quality. University of California, 1981.