Ang, R. H., Dee, A. R. B., Dimarucot, A. J. A., & Sanchez, J. B. S. (1998). A Feasibility study on Gomax: Surfacing Mat made from recycled rubber chips. College of Engineering.

Ang, Rainiel H., Allan Richmond B. Dee, Allen Jason A. Dimarucot, and Joseph Bernard S. Sanchez. A Feasibility Study on Gomax: Surfacing Mat Made from Recycled Rubber Chips. Diliman, Quezon City: College of Engineering, 1998.

Ang, Rainiel H., et al. A Feasibility Study on Gomax: Surfacing Mat Made from Recycled Rubber Chips. College of Engineering, 1998.