N. S. Haile, and J. D. Bignell. 1971. “Late Cretaceous Age Based on K/Ar Dates of Granitic Rock from the Tambelan and Bunguran Islands, Sunda Shelf, Indonesia”. Netherlands Journal of Geosciences, January, 687-90. https://njgjournal.nl/index.php/njg/article/view/14868.