Gaya APA

Polit, D, F., Beck, C, T. (2004). Nursing Research Principles and Methods (Ed 7). USA: Lippincott Williams & Wilkins.

Gaya MLA

Polit, Denise, F.., Beck, Cheryl, Tatano. "Nursing Research Principles and Methods". Ed 7 USA: Lippincott Williams & Wilkins, 2004. Text.