SpringerLink (Online Service) & Obi, A. (2011). Institutional constraints to small farmer development in Southern Africa. Wageningen Academic Publishers.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)SpringerLink (Online Service) و Ajuruchukwu Obi. Institutional Constraints to Small Farmer Development in Southern Africa. Wageningen: Wageningen Academic Publishers, 2011.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)SpringerLink (Online Service) و Ajuruchukwu Obi. Institutional Constraints to Small Farmer Development in Southern Africa. Wageningen Academic Publishers, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.