Gaya APA

Polit, D, F., Beck, C, T. (2010). Essentials of nursing research : appraising evidence for nursing practice 7th Edition (7). Philadelphia: Wolter kluwer.

Gaya MLA

Polit, Denise, F., Beck, Cheryl, Tatano. "Essentials of nursing research : appraising evidence for nursing practice 7th Edition". 7 Philadelphia: Wolter kluwer, 2010. Text.