Gaya APA

Polit, D, F., Beck, C, T. (2006). ESSSENTIALS OF NURSING RESEARCH : Methods, Appraisal, and Utilazation . Philadelphia: Lippincott Williams & Wilkins.

Gaya MLA

Polit, Denise, F., Beck, Cheril, Tatono. "ESSSENTIALS OF NURSING RESEARCH : Methods, Appraisal, and Utilazation". Philadelphia: Lippincott Williams & Wilkins, 2006. Text.