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Tan, K.H. 1991. Principles of Soils Chemistry (Dasar-dasar Kimia Tanah, alih bahasa D.H. Goenadi). Gadjah Mada University Press, Yogyakarta.
Kouda, I.E., E. Morgun, and T.W. Boutton. 2010. Verctic processes and specificity of organic matter properties and distribution in vertisols. Eurasian Soil Science 43(13): 1467-1476
Wellock, M.L., B. Reidy, C.M. Laperele, T. Bolger and G. Kieley. 2011. Soil organic carbon stocks of afforested peatlands in Ireland. Forestry 84(4): 441-451.
Olaleye, A.O., G.E. Akinbola, and B.O. Akintade. 2011. Gravel, Soil Organic Matter, and texture in followed Alfisols, Entisols, and Ultisols: Implication for root and tuber crops. Communication in Soil Science and Plant Analysis. 42(41): 2624-2641.