- ^ a b "Olongapo City - Brief History".
- ^ It was recorded customary for the Sambal to execute those who have taken another person’s life, unless done by decapitation. Their manner of execution was to bore a hole at the top of the skull and then scrape out the brains.
- ^ http://olongapo-subic.com/olongapo_city_subic_bay_zambales_museum_legend.htm
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