Cita APA (7th ed.)

Leedy, P. D. (1993). Practical research: Planning and design (5th ed.). Prentice Hall.

Cita Chicago (17th ed.)

Leedy, Paul D. Practical Research: Planning and Design. 5th ed. New Jersey: Prentice Hall, 1993.

Cita MLA (9th ed.)

Leedy, Paul D. Practical Research: Planning and Design. 5th ed. Prentice Hall, 1993.