Não informado. (2016). Agronomic-Economic Research on Soils of the Tropics. North Carolina State University, Soil Science Department.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Agronomic-Economic Research on Soils of the Tropics. Raleigh, NC: North Carolina State University, Soil Science Department, 2016.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Agronomic-Economic Research on Soils of the Tropics. North Carolina State University, Soil Science Department, 2016.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.