Dyfyniad APA

Polit, D. F. (1991). Nursing research: Principles and methods (4th ed.). Lippincott.

Dyfyniad Arddull Chicago

Polit, Denise F. Nursing Research: Principles and Methods. 4th ed. Philadelphia: Lippincott, 1991.

Dyfyniad MLA

Polit, Denise F. Nursing Research: Principles and Methods. 4th ed. Lippincott, 1991.

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