1. Archer, R. W. (1986). The use of the land-pooling/readjustment technique to improve land development in Bangkok. Habitat International, 10, 155–165.
2. Asahi, Y., Miwa, T., & Ishikawa, T. (1993). Investigation on sandpit of mountain area in Kimitsu region of Chiba Prefecture (II). Report of Environmental Research Organization of Chiba University, 18, 34–39 (In Japanese).
3. Aurelio M. A., & Peña R. E. (Eds.). (2002). Geology and mineral resources of the philippines: Volume 1 geology. Quezon City, The Philippines: Mines and Geosciences Bureau, Department of Environment and Natural Resources.
4. Department of Public Works and Highways (DPWH). (2005). Building code of the Philippines. Manila: DPWH.
5. Drew, L. J., Langer, W. H., & Sachs, J. S. (2002). Environmentalism and natural aggregate mining. Natural Resources Research, 11, 19–28.