Reading about the culture, folklore, and mythology of the Philippines was difficult for a long time. While some people are able to rely on the stories told by their parents, lolos, and lolas, others (like myself) needed to rely on online sources like The Aswang Project and PHSpirits for a long time.
Over time, it's been easier and easier to find books that provide some insights into our mythos. Here's our ever-growing book list of what we have been using to create our artwork and plushies:
Overviews:
The Aswang Inquiry by Frank Lynch, S.J.
Outline of Philippine Mythology by F. Landa Jocano
Witchcraft, Filipino Style by Nid Anima
The Aswang Complex in Philippine Folklore by Maximo D. Ramos
The Creatures of Midnight by Maximo D. Ramos
The Creatures of Philippine Lower Mythology by Maximo D. Ramos
Boxer Codex with a Modern Spanish Transcription and English Translation
Filipino Popular Tales by Dean S. Fansler