International Conference of Agricultural Economists & International Association of Agricultural Economists. (1956). Proceedings of the ninth International Conference of Agricultural Economists. oxford university press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Conference of Agricultural Economists و International Association of Agricultural Economists. Proceedings of the Ninth International Conference of Agricultural Economists. new York: oxford university press, 1956.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)International Conference of Agricultural Economists و International Association of Agricultural Economists. Proceedings of the Ninth International Conference of Agricultural Economists. oxford university press, 1956.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.