"PINTONG ISABELA II". NATIONAL REGISTRY OF NATIONAL HISTORICAL COMMISSION OF THE PHILIPPINES MARKERS. Archived from the original on 3 November 2016. Retrieved 2 November 2016.
"PINTONG ISABELA II". NATIONAL REGISTRY OF NATIONAL HISTORICAL COMMISSION OF THE PHILIPPINES MARKERS. Archived from the original on 3 November 2016. Retrieved 2 November 2016.