Dyfyniad APA

Gagne, R. M. (1962). Psychological principles in system development. Holt Rinehart and wiston.

Dyfyniad Arddull Chicago

Gagne, Robert M. Psychological Principles in System Development. New York: Holt Rinehart and wiston, 1962.

Dyfyniad MLA

Gagne, Robert M. Psychological Principles in System Development. Holt Rinehart and wiston, 1962.

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