Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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