Gaya APA
Polit, D, F. et al (2001).
Essentials of Nursing Research : Methods, Appraisal, and Utilization .
Philadelpia:
Lippincott.
Gaya MLA
Polit, Denise, F.. et al.
"Essentials of Nursing Research : Methods, Appraisal, and Utilization".
Philadelpia:
Lippincott,
2001.
Text.