APA (7th ed.) Citation

Polit, D. F., & Hungler, B. P. (1991). Nursing research: Principles and methods (4th edition.). J. B. Lippincott.

Chicago Style (17th ed.) Citation

Polit, Denise F., and Bernadette P. Hungler. Nursing Research: Principles and Methods. 4th edition. New York: J. B. Lippincott, 1991.

MLA (8th ed.) Citation

Polit, Denise F., and Bernadette P. Hungler. Nursing Research: Principles and Methods. 4th edition. J. B. Lippincott, 1991.