Bellwood, Peter; Dizon, Eusebio (2013). "The Batanes Islands, Their First Observers, and Previous Archaeology". In Bellwood, Peter; Dizon, Eusebio (eds.). 4000 Years of Migration and Cultural Exchange: The Archaeology of the Batanes Islands, Northern Philippines. ANU E Press. pp. 1–8. doi:10.22459/TA40.12.2013.01. ISBN9781925021288. JSTORj.ctt5hgz91.6.
Bellwood, Peter; Dizon, Eusebio (2013). "The Batanes Islands, Their First Observers, and Previous Archaeology". In Bellwood, Peter; Dizon, Eusebio (eds.). 4000 Years of Migration and Cultural Exchange: The Archaeology of the Batanes Islands, Northern Philippines. ANU E Press. pp. 1–8. doi:10.22459/TA40.12.2013.01. ISBN9781925021288. JSTORj.ctt5hgz91.6.
Peralta, Jesus T. "Ivatan/Itbayat". Glimpses: Peoples of the Philippines. National Commission for Culture and the Arts. Archived from the original on January 21, 2008. Retrieved April 7, 2008.
ncip.gov.ph
"The Ivatan". National Commission on Indigenous Peoples. Archived from the original on March 11, 2008. Retrieved April 7, 2008.
Peralta, Jesus T. "Ivatan/Itbayat". Glimpses: Peoples of the Philippines. National Commission for Culture and the Arts. Archived from the original on January 21, 2008. Retrieved April 7, 2008.