APA-Zitierstil (7. Ausg.)

Leedy, P. D., Ormrod, J. E., & Johnson, L. R. (2019). Practical research: Planning and design (Twelfth edition.). Pearson.

Chicago-Zitierstil (17. Ausg.)

Leedy, Paul D., Jeanne Ellis Ormrod, und Laura Ruth Johnson. Practical Research: Planning and Design. Twelfth edition. NY, NY: Pearson, 2019.

MLA-Zitierstil (9. Ausg.)

Leedy, Paul D., et al. Practical Research: Planning and Design. Twelfth edition. Pearson, 2019.