Dyfyniad APA

England, W. B., & Leenders, M. R. (1975). Purchasing and materials management (6th ed.). Richard D. Irwin.

Dyfyniad Arddull Chicago

England, Wilbur B., and Michiel R. Leenders. Purchasing and Materials Management. 6th ed. Illinois: Richard D. Irwin, 1975.

Dyfyniad MLA

England, Wilbur B., and Michiel R. Leenders. Purchasing and Materials Management. 6th ed. Richard D. Irwin, 1975.

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