Gaya APA

Polit, D, F., Hungler, B, P. (1995). Nursing Research : Principles and Methods (7). Pennsylvania: J.B Lippincott Company.

Gaya MLA

Polit, Denise, F.., Hungler, Bernadette, P.. "Nursing Research : Principles and Methods". 7 Pennsylvania: J.B Lippincott Company, 1995. Text.