Παραπομπή σε μορφή APA (7η εκδ.)

Ryan, M., Abeyratne, F., & Farrington, J. (1981). Animal draught: The economics of revival. Agrarian Research and Training Institute.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ryan, M., Fredrick Abeyratne, και Joseph Farrington. Animal Draught: The Economics of Revival. Colombo, Sri Lanka: Agrarian Research and Training Institute, 1981.

Παραπομπή σε μορφή MLA (8th εκδ.)

Ryan, M., et al. Animal Draught: The Economics of Revival. Agrarian Research and Training Institute, 1981.