Philippine Water Works Association -Quezon City, PH

City, P.H.Philippine & IWSA -London, GB, International Water Association, 1981. 3rd Asia Pacific Regional Water Supply Conference and Exhibition, Nov. 15-19, 1981, PICC, Manila, Philippines : proceedings, Quezon City, The Philippines: PWWA. Available at: https://es.ircwash.org/sites/default/files/71IWSA81-1146.pdf.