Dyfyniad APA

Babbie, E. (2001). The practice of social research (9th ed.). Wadsworth.

Dyfyniad Arddull Chicago

Babbie, Earl. The Practice of Social Research. 9th ed. Australia: Wadsworth, 2001.

Dyfyniad MLA

Babbie, Earl. The Practice of Social Research. 9th ed. Wadsworth, 2001.

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