Polit, Denise F.
Nursing research: principles and methods
Lippincott, 1999
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Polit, Denise F.
Nursing research: principles and methods
Lippincott Williams & Wilkins, 2004
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Polit, Denise F.
Nursing research: principles and methods
J.B. Lippincott, 1995
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Seaman, Catherine H. C.
Research methods : for undergraduate students in nursing
Appleton Century Cropts, 1982
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Polit, Denise F.
Essential of nursing research : methods, apprisal and utilization
Lippincott, 2001
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