Cita APA (7a ed.)

Leedy Paul D. (2001). Practical Research Planning and Design. Merrill Prentice Hall.

Cita Chicago Style (17a ed.)

Leedy Paul D. Practical Research Planning and Design. MPH: Merrill Prentice Hall, 2001.

Cita MLA (9a ed.)

Leedy Paul D. Practical Research Planning and Design. Merrill Prentice Hall, 2001.