https://outoftownblog.com/san-andres-fort-fort-santiago-forgotten-warriors/
https://romblonparadise.com/fort-san-andres-in-romblon/
https://www.journeyera.com/fort-san-andres-romblon/
https://www.globalpinays.com/2016/12/a-heritage-in-retrospect-fuerza-san.html
https://www.philippinen-tours.de/romblon-island/