Cita APA (7a ed.)

Leedy, P. D., Ormrod, J. E., & Johnson, L. R. (2021). Practical research: Planning and design (Twelfth, global edition.). Pearson.

Cita Chicago Style (17a ed.)

Leedy, Paul D., Jeanne Ellis Ormrod, y Laura Ruth Johnson. Practical Research: Planning and Design. Twelfth, global edition. Harlow, England: Pearson, 2021.

Cita MLA (8a ed.)

Leedy, Paul D., et al. Practical Research: Planning and Design. Twelfth, global edition. Pearson, 2021.