Παραπομπή σε μορφή APA (7η εκδ.)

Leedy, P. D., Newby, T. J., & Ertmer, P. A. (1997). Practical research: Planning and design (6th ed.). Merrill, an imprint of Prentice Hall.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Leedy, Paul D., Timothy J. Newby, και Peggy A. Ertmer. Practical Research: Planning and Design. 6th ed. Upper Saddle River: Merrill, an imprint of Prentice Hall, 1997.

Παραπομπή σε μορφή MLA (9th εκδ.)

Leedy, Paul D., et al. Practical Research: Planning and Design. 6th ed. Merrill, an imprint of Prentice Hall, 1997.