Berbalangs of Cagayan Sulu (sources)
- "XI. Cagayan Sulu, its Customs, Legends and Superstitions," by Ethelbert Forbes Skertchly, article in the Journal of the Asiatic Society of Bengal, Vol. LXV., Part. III - Anthropology and Cognate Subjects. No. 1 - 1896. Pgs. 47-57. Online at: https://books.google.com/books?id=4zdBAQAAMAAJ&pg=RA2-PA55&dq=berbalangs&hl=en&sa=X&ei=dQVDVcq6Os_EogS_ooDQDQ&ved=0CFkQ6AEwCg#v=onepage&q=berbalangs&f=false
- Oddities, by Rupert T. Gould, 1969 Paperback Library Edition, New York, New York, USA. Originally published in 1928. Pgs. 110-118. Online: https://archive.org/details/B-001-015-438/page/n95/mode/2up?view=theater
- Even More Short & Shivery, by Robert D. San Souci, 2003 Yearling Books, USA [first published 1997]. ISBN: 0-440-41877-1. Pgs. 20-23. Online [preview]: https://books.google.com/books?id=WnlpluPNlaMC&pg=PA20&lpg=PA20&dq=%22Andrew+Simmons%22+%22berbalangs%22&source=bl&ots=3B_tHLW67i&sig=ACfU3U0qAaZMFQAhWqDdnXI6gruMUkm_Pw&hl=en&sa=X&ved=2ahUKEwizjfWo6aj5AhV5EEQIHe8ID7gQ6AF6BAgCEAM#v=onepage&q=%22Andrew%20Simmons%22%20%22berbalangs%22&f=false
- "List of Advanced Dungeons & Dragons 2nd edition monsters," page in the Wikipedia website, viewed 8-2-2022. Online: https://en.wikipedia.org/wiki/List_of_Advanced_Dungeons_%26_Dragons_2nd_edition_monsters
- "Berbalang," page in the AideDD website, viewed 8-2-2022. Online: https://www.aidedd.org/dnd/monstres.php?vo=berbalang