(1998). Davao City Water District: A pioneer in the water supply industry. Philippine Panorama.
Chicago Style (17. basım) Atıf"Davao City Water District: A Pioneer in the Water Supply Industry." Philippine Panorama 1998.
MLA (9th ed.) Atıf"Davao City Water District: A Pioneer in the Water Supply Industry." Philippine Panorama, 1998.
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