Gaya APA
Polit, D, F. (2004).
nursing research principles and methods (7).
Philadelpia-USA:
Lippincot Williams & Wilkins.
Gaya MLA
Polit, Denise, F..
"nursing research principles and methods".
7
Philadelpia-USA:
Lippincot Williams & Wilkins,
2004.
Keperawatan.