139. References Agoncillo, Teodoro A. (1990). History of the Filipino people. Quezon city: Garotech Publishing. Diaz, Christine L. (2009). The other Philippine history textbook: precolonial Philippines to the revolution, book 1. Pasig City: Anvil Publishing, Inc. Zaide, Sonia M. (1999). The Philippines: a unique nation. Quezon City. All Nations Publishing Co., Inc