Amir, P., & Knipscheer, H. C. (1989). Conducting on-farm animal research: Procedures and economic analysis. Winrock International Institute for Agricultural Development and International Development Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Amir, Pervaiz, و Hendrik C. Knipscheer. Conducting On-farm Animal Research: Procedures and Economic Analysis. Singapore: Winrock International Institute for Agricultural Development and International Development Research, 1989.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Amir, Pervaiz, و Hendrik C. Knipscheer. Conducting On-farm Animal Research: Procedures and Economic Analysis. Winrock International Institute for Agricultural Development and International Development Research, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.