Dyfyniad APA

Wagenaar, T. C., & Babbie, E. (1989). Practicing social research (5th ed.). Wadsworth.

Dyfyniad Arddull Chicago

Wagenaar, Theodore C., and Earl Babbie. Practicing Social Research. 5th ed. California: Wadsworth, 1989.

Dyfyniad MLA

Wagenaar, Theodore C., and Earl Babbie. Practicing Social Research. 5th ed. Wadsworth, 1989.

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