Rawal, N., K. K. Acharya, C. R. Bam, and K. Acharya. “Soil Fertility Mapping of Different VDCs of Sunsari District, Nepal Using GIS”. International Journal of Applied Sciences and Biotechnology, vol. 6, no. 2, June 2018, pp. 142-51, doi:10.3126/ijasbt.v6i2.20424.