Gaya APA

Polit, D, F., Hungler, B, P. (1999). NURSING RESEARCH : Principles and Methods . Philadelphia: J. B. Lippincott.

Gaya MLA

Polit, Danise, F., Hungler, Bernadette, P. "NURSING RESEARCH : Principles and Methods". Philadelphia: J. B. Lippincott, 1999. Text.