Byers, A., & Liu, P. (2008). Value-adding standards in the North American food market: Trade opportunities in certified products for developing countries.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Byers, Alice, و Pascal Liu. Value-adding Standards in the North American Food Market: Trade Opportunities in Certified Products for Developing Countries. 2008.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Byers, Alice, و Pascal Liu. Value-adding Standards in the North American Food Market: Trade Opportunities in Certified Products for Developing Countries. 2008.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.