Cita APA

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

Chicago Style Citation

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

Cita MLA

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