Gaya APA

Polit, D, F. et al (2001). Essentials of Nursing Research: methods, appraisal, and utilization (5). Amerika: Lippincott Williams & Wilkins.

Gaya MLA

Polit, Danise, F.. et al. "Essentials of Nursing Research: methods, appraisal, and utilization". 5 Amerika: Lippincott Williams & Wilkins, 2001. Text.