Tennessee Valley Authority. (1970). Estimated world fertilizer production capacity as related to future needs 1970 to 1975.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Tennessee Valley Authority. Estimated World Fertilizer Production Capacity as Related to Future Needs 1970 to 1975. [Muscle Shoals, Alabama, National Fertilizer Development Center], 1970.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Tennessee Valley Authority. Estimated World Fertilizer Production Capacity as Related to Future Needs 1970 to 1975. 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.