Dyfyniad APA

Walling, D. R. (1995). At the threshold of the millenium. Phi Delta Kappa Educational Foundation.

Dyfyniad Arddull Chicago

Walling, Donovan R. At the Threshold of the Millenium. Indiana: Phi Delta Kappa Educational Foundation, 1995.

Dyfyniad MLA

Walling, Donovan R. At the Threshold of the Millenium. Phi Delta Kappa Educational Foundation, 1995.

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