Gaya APA

Polit, D, F., Hungler, B, P. (1999). Nursing Research : Principles and Methods 6th ed. (6). Philadelphia: Lippincot Williams & Wilkins.

Gaya MLA

Polit, Denise, F.., Hungler, Bernadette, P.. "Nursing Research : Principles and Methods 6th ed.". 6 Philadelphia: Lippincot Williams & Wilkins, 1999. Text.