Abinales, Patricio N. (July 8, 2022). Modern Philippines. ABC-CLIO. ISBN 978-1-4408-6005-8. Boquet, Yves (April 19, 2017). The Philippine Archipelago. Springer...
Understanding Modern Nations. Santa Barbara, Calif.: ABC-CLIO. ISBN 978-1-4408-6005-8. Archived from the original on February 17, 2023. Retrieved February...