APA

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

Chicago

Schultz Theodore W,, . 1980. Investing in people : The economics of population quality. London: University of California Press.

Harvard

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

MLA

Schultz Theodore W,, . Investing in people : The economics of population quality. London: University of California Press. 1980.