Παραπομπή σε μορφή APA (7η εκδ.)

Petersen, W. E., & Gregory, R. W. (1950). Dairy science: Its principles and practice (2nd ed.). J. B. Lippincott Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Petersen, W. E., και R. W. Gregory. Dairy Science: Its Principles and Practice. 2nd ed. Chicago: J. B. Lippincott Company, 1950.

Παραπομπή σε μορφή MLA (8th εκδ.)

Petersen, W. E., και R. W. Gregory. Dairy Science: Its Principles and Practice. 2nd ed. J. B. Lippincott Company, 1950.