توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

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

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

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.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

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