Gaya APA

Polit, D, F., Hungler, B, P. (1995). Nursing RESEARCH Principles and Methods . America: J.B. Lippincott Company.

Gaya MLA

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