1. Crop Suitability and Soil Fertility Mapping using Geographic Information System (GIS)
2. Arnoldus, H. M. J. (1978): An approximation of the rainfall factor in the Universal Soil loss Equation. In: De Boodt, M. & Gabriels, D. (eds): Assessment of erosion, pp. 127-132. Wiley, Chichester.
3. Bureau of Soil and Water Management (BSWM-LREP): Land Resources Evaluation Project; Physical Land Resources, Quezon Province: Vol. 1. DA-BSWM, Quezon City, Philippines.
4. Calanog, L. and Calderon. (1990): The Philippine upland communities: Socio-demographic update. In: Highlights '95. PCARRD, Los Baños, Laguna. p. 167
5. Cowen, J. (1993): A proposed method for calculating the LS factor for use with the USLE in a grid-based environment: Proceedings of the 3th annual ESRI user conference, pp. 65-74.