Cita APA (7a ed.)

Polit, D. F. (1991). Nursing research: Principles and methods (4th ed.). Lippincott.

Cita Chicago Style (17a ed.)

Polit, Denise F. Nursing Research: Principles and Methods. 4th ed. Philadelphia: Lippincott, 1991.

Cita MLA (8a ed.)

Polit, Denise F. Nursing Research: Principles and Methods. 4th ed. Lippincott, 1991.