1. Philippine Agricultural Engineering Standards;Agricultural Machinery Testing and Evaluation Center (AMTEC),2003
2. Test Results of Walking-type Agricultural Tractor: Floating Type;AMTEC,2012
3. Preliminary investigations into the performance of different shaped blades for the rotary tillage of wet rice soil;Beeny;J. Agric. Eng. Res.,1970
4. Comparison of Land Preparation Equipment Used in Small Rice Farms in the Philippines;Calilung,1985
5. Selected Statistics on Agriculture;Department of Agriculture-Bureau of Statistics (DA-BAS),2011