Rubio, A. R., Maaño, J. E. V., & Zarco, M. A. H. (2017). The effect of acid rain exposure to the mass and particle size distribution of limestone soils. College of Engineering, University of the Philippines Diliman.

Rubio, Aimyel R., John Emmanuel V. Maaño, and Mark Albert H. Zarco. The Effect of Acid Rain Exposure to the Mass and Particle Size Distribution of Limestone Soils. Quezon City: College of Engineering, University of the Philippines Diliman, 2017.

Rubio, Aimyel R., et al. The Effect of Acid Rain Exposure to the Mass and Particle Size Distribution of Limestone Soils. College of Engineering, University of the Philippines Diliman, 2017.