Cita APA (7a ed.)

Leedy, P. D., & Ormrod, J. E. (2005). Practical research: Planning and design (8th ed.). Prentice Hall.

Cita Chicago Style (17a ed.)

Leedy, Paul D., y Jeanne Ellis Ormrod. Practical Research: Planning and Design. 8th ed. Upper Saddle River, N.J.: Prentice Hall, 2005.

Cita MLA (8a ed.)

Leedy, Paul D., y Jeanne Ellis Ormrod. Practical Research: Planning and Design. 8th ed. Prentice Hall, 2005.