United States Department of Agriculture. (1956). Water: The yearbook of agriculture 1955. The United States Government Printing Office.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States Department of Agriculture. Water: The Yearbook of Agriculture 1955. Washington, D.C: The United States Government Printing Office, 1956.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)United States Department of Agriculture. Water: The Yearbook of Agriculture 1955. The United States Government Printing Office, 1956.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.