(1987). Soil fertility and organic matter as critial components of production systems. Madison, USA: Soil Science Society of America, Inc.
استشهاد بنمط شيكاغوSoil Fertility and Organic Matter As Critial Components of Production Systems. Madison, USA: Soil Science Society of America, Inc, 1987.
MLA استشهادSoil Fertility and Organic Matter As Critial Components of Production Systems. Madison, USA: Soil Science Society of America, Inc, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.