Gaya APA

Polit, D, F., Beck, C, T. (2004). Essentials of Nursing research (Methods, appraisal and Utilization) (7). USA America: J. B. Lippincott Company.

Gaya MLA

Polit, Denise, F.., Beck, Cheryl, Tatano. "Essentials of Nursing research (Methods, appraisal and Utilization)". 7 USA America: J. B. Lippincott Company, 2004. Text.