APA استشهاد

Wykstra, R. A. (1971). Education and the economics of human capital. Free Press.

استشهاد بنمط شيكاغو

Wykstra, Ronald A. Education and the Economics of Human Capital. New York: Free Press, 1971.

MLA استشهاد

Wykstra, Ronald A. Education and the Economics of Human Capital. Free Press, 1971.