Cita APA (7th ed.)

Leedy, P. D. (1980). Practical research: Planning and Desgn (2nd ed.). Macmillan.

Cita Chicago (17th ed.)

Leedy, Paul D. Practical Research: Planning and Desgn. 2nd ed. New York: Macmillan, 1980.

Cita MLA (9th ed.)

Leedy, Paul D. Practical Research: Planning and Desgn. 2nd ed. Macmillan, 1980.