United States. Agricultural Research Service. (1963). Soil and water conservation research in the Pacific northwest. Gov't..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Agricultural Research Service. Soil and Water Conservation Research in the Pacific Northwest. Wash., D.C.: Gov't., 1963.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. Agricultural Research Service. Soil and Water Conservation Research in the Pacific Northwest. Gov't., 1963.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.