Παραπομπή σε μορφή APA (7η εκδ.)

Dülfer, E. (1974). Operational efficiency of agricultural cooperatives in developing countries. Food and Agriculture Organization of the United Nations ; [sold by] Unipub.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Dülfer, Eberhard. Operational Efficiency of Agricultural Cooperatives in Developing Countries. Rome : New York: Food and Agriculture Organization of the United Nations ; [sold by] Unipub, 1974.

Παραπομπή σε μορφή MLA (8th εκδ.)

Dülfer, Eberhard. Operational Efficiency of Agricultural Cooperatives in Developing Countries. Food and Agriculture Organization of the United Nations ; [sold by] Unipub, 1974.