Schultz, T. W. (1980). Investing in people: The economics of population quality. London: University Of California Press.
Dyfyniad Arddull ChicagoSchultz, Theodore W. Investing in People: The Economics of Population Quality. London: University Of California Press, 1980.
Dyfyniad MLASchultz, Theodore W. Investing in People: The Economics of Population Quality. London: University Of California Press, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.