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"List of Provinces". PSGC Interactive. Makati City, Philippines: National Statistical Coordination Board. Archived from the original on April 19, 2016. Retrieved March 5, 2020.
"List of Provinces". PSGC Interactive. Makati City, Philippines: National Statistical Coordination Board. Archived from the original on April 19, 2016. Retrieved March 5, 2020.
Contributor, Staff (April 25, 2016). "UMALI, Ismael G."Bantayog ng mga Bayani. Archived from the original on October 7, 2020. Retrieved October 4, 2020. {{cite web}}: |last= has generic name (help)