Hafenrichter, A. L. (1968). Grasses and legumes for soil conservation in the Pacific Northwest and Great Basin States. U.S. Soil Conservation Service.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hafenrichter, A. L. Grasses and Legumes for Soil Conservation in the Pacific Northwest and Great Basin States. Washington: U.S. Soil Conservation Service, 1968.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hafenrichter, A. L. Grasses and Legumes for Soil Conservation in the Pacific Northwest and Great Basin States. U.S. Soil Conservation Service, 1968.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.