Cita APA (7th ed.)

Leedy, P. D. (1985). Practical Research: Planning and design (3rd.ed.). Macmillan.

Cita Chicago (17th ed.)

Leedy, Paul D. Practical Research: Planning and Design. 3rd.ed. New York: Macmillan, 1985.

Cita MLA (9th ed.)

Leedy, Paul D. Practical Research: Planning and Design. 3rd.ed. Macmillan, 1985.