Dyfyniad APA

Leedy, P. D. (1985). Practical Research: Planning and design (3rd.ed.). Macmillan.

Dyfyniad Arddull Chicago

Leedy, Paul D. Practical Research: Planning and Design. 3rd.ed. New York: Macmillan, 1985.

Dyfyniad MLA

Leedy, Paul D. Practical Research: Planning and Design. 3rd.ed. Macmillan, 1985.

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