Dyfyniad APA

Babbie, E. (1989). The practice of social research (5th.ed.). Wadsworth.

Dyfyniad Arddull Chicago

Babbie, Earl. The Practice of Social Research. 5th.ed. Belmont: Wadsworth, 1989.

Dyfyniad MLA

Babbie, Earl. The Practice of Social Research. 5th.ed. Wadsworth, 1989.

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