Green land, D., & Lal, R. (1979). Soil physical properties and crop production in the tropics. John Wiley and Sons.
استشهاد بنمط شيكاغوGreen land, D.J, و R. Lal. Soil Physical Properties and Crop Production in the Tropics. New York: John Wiley and Sons, 1979.
MLA استشهادGreen land, D.J, و R. Lal. Soil Physical Properties and Crop Production in the Tropics. John Wiley and Sons, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.