Gaya APA

Polit, D, F., Beck, C, T. (2003). Nursing Research : Principles and Methods . : Lippincott Williams & Wilkins.

Gaya MLA

Polit, Denise, F., Beck, Cherly, Tatano. "Nursing Research : Principles and Methods". : Lippincott Williams & Wilkins, 2003. Text.