Cita APA (7a ed.)

Leedy, P. D. (2005). Practical research planning and design Paul D. Leedy, Jeanne Ellis Ormrod. Pearson Educatin.

Cita Chicago Style (17a ed.)

Leedy, Paul D. Practical Research Planning and Design Paul D. Leedy, Jeanne Ellis Ormrod. Pearson Educatin, 2005.

Cita MLA (8a ed.)

Leedy, Paul D. Practical Research Planning and Design Paul D. Leedy, Jeanne Ellis Ormrod. Pearson Educatin, 2005.