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Polit, Denise F and Beck, Cheryl Tatano (2017) Nursing Research Generating and Assessing Evidence For Nursing Practice Tenth edition. Wolters Kluwer.
Polit, Denise F and Beck, Cheryl Tatano (2012) NURSING RESEARCH: GENERATING AND ASSESSING EVIDENCE FOR NURSING PRACTICE Ninth Edition. Wolters Kluwer.