APA aipamena

Schultz, T. W. (1980). Investing in people: The economics of population quality. London: University Of California Press.

Chicago Style aipamena

Schultz, Theodore W. Investing in People: The Economics of Population Quality. London: University Of California Press, 1980.

MLA aipamena

Schultz, Theodore W. Investing in People: The Economics of Population Quality. London: University Of California Press, 1980.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.