Scott, William Henry (1994). "Chapter 12 - Tagalog Society and Religion". Barangay: Sixteenth-century Philippine Culture and Society (dalam bahasa Inggeris). Ateneo University Press. m/s. 232. ISBN9789715501354. The Bornean arquebus (astingal) was also known, but the Spaniards seem never to have faced any in Luzon encounters as they did in Mindanao.