National Research Council (U.S.). Board on Agriculture. Committee on Conservation Needs and Opportunities. (1986). Soil conservation: Assessing the national resources inventory. National Academy Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Research Council (U.S.). Board on Agriculture. Committee on Conservation Needs and Opportunities. Soil Conservation: Assessing the National Resources Inventory. Washington, D.C.: National Academy Press, 1986.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Research Council (U.S.). Board on Agriculture. Committee on Conservation Needs and Opportunities. Soil Conservation: Assessing the National Resources Inventory. National Academy Press, 1986.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.