Stern, P. C. (1996). Evaluating social science research (2nd ed.). Oxford University Press.
Dyfyniad Arddull ChicagoStern, Paul C. Evaluating Social Science Research. 2nd ed. New York: Oxford University Press, 1996.
Dyfyniad MLAStern, Paul C. Evaluating Social Science Research. 2nd ed. Oxford University Press, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.