Wijanarko, A., and B. H. Purwanto. “Effect of Land Use and Organic Matter on Nitrogen and Carbon Labile Fractions in a Typic Hapludult”. Journal of Degraded and Mining Lands Management, vol. 4, no. 3, Apr. 2017, pp. 837-43, doi:10.15243/jdmlm.2017.043.837.