Παραπομπή σε μορφή APA (7η εκδ.)

Gray, W., & Rizzo, N. D. (1973). Unity through diversity: A Festschrift for Ludwig von Bertalanffy. Gordon and Breach Science Publishers.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gray, William, και Nicholas D. Rizzo. Unity Through Diversity: A Festschrift for Ludwig Von Bertalanffy. New York: Gordon and Breach Science Publishers, 1973.

Παραπομπή σε μορφή MLA (8th εκδ.)

Gray, William, και Nicholas D. Rizzo. Unity Through Diversity: A Festschrift for Ludwig Von Bertalanffy. Gordon and Breach Science Publishers, 1973.