Gaya APA
Polit, D, F., Hungler, B, P. (1999).
Nursing Research : Principles and methods (Sixth Edition).
Philadephia:
Lippincott.
Gaya MLA
Polit, Denise, F.., Hungler, Bernadette, P..
"Nursing Research : Principles and methods".
Sixth Edition
Philadephia:
Lippincott,
1999.
Text.