Gaya APA

Polit, D, F. et al (1997). Essentials Of Nursing Research : Methods, Appraisal, and Utilization (4). New York: Lippincot.

Gaya MLA

Polit, Denise, F.. et al. "Essentials Of Nursing Research : Methods, Appraisal, and Utilization". 4 New York: Lippincot, 1997. Text.