Παραπομπή σε μορφή APA (7η εκδ.)

Wallen, N. E., & Fraenkel, J. R. (2000). Educational research: A guide to the process (2nd ed.). Lawrence Erlbaum Associates.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Wallen, Norman E., και Jack R. Fraenkel. Educational Research: A Guide to the Process. 2nd ed. Mahwah, N.J.: Lawrence Erlbaum Associates, 2000.

Παραπομπή σε μορφή MLA (8th εκδ.)

Wallen, Norman E., και Jack R. Fraenkel. Educational Research: A Guide to the Process. 2nd ed. Lawrence Erlbaum Associates, 2000.