APA (7e ed.) Bronvermelding

Leedy, P. D., & Ormrod, J. E. (2005). Practical research: Planning and design (8th ed.). Pearson/Merrill Prentice-Hall.

Chicago (17e ed.) Bronvermelding

Leedy, Paul D., en Jeanne Ellis Ormrod. Practical Research: Planning and Design. 8th ed. Upper Saddle River, N.J: Pearson/Merrill Prentice-Hall, 2005.

MLA (9e ed.) Bronvermelding

Leedy, Paul D., en Jeanne Ellis Ormrod. Practical Research: Planning and Design. 8th ed. Pearson/Merrill Prentice-Hall, 2005.