Não informado. Tropical Soils Research Program, Annual Report. North Carolina State University, Soil Science Department.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Tropical Soils Research Program, Annual Report. Raleigh, NC: North Carolina State University, Soil Science Department.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Tropical Soils Research Program, Annual Report. North Carolina State University, Soil Science Department.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.