Dyfyniad APA

Cumper,George E. (1991). The evaluation of national systems. Oxford University Press.

Dyfyniad Arddull Chicago

Cumper,George E. The Evaluation of National Systems. New york: Oxford University Press, 1991.

Dyfyniad MLA

Cumper,George E. The Evaluation of National Systems. Oxford University Press, 1991.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.