Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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