Cita APA (7th ed.)
Leedy, P., & Ormrod, J. E. (2010). Practical research: Planning and design (9th ed.). Pearson Education International.
Cita Chicago (17th ed.)
Leedy, Paul, i Jeanne Ellis Ormrod. Practical Research: Planning and Design. 9th ed. Upper saddle river, New Jersey: Pearson Education International, 2010.
Cita MLA (9th ed.)
Leedy, Paul, i Jeanne Ellis Ormrod. Practical Research: Planning and Design. 9th ed. Pearson Education International, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.