M.E.M. De Smet, P.A. Sumosusastro, I. Siregar, L.J. Van Marle, S.R. Troelstra, and A.R. Fortuin. 1989. “Late Cenozoic Geohistory of Seram, Indonesia”. Netherlands Journal of Geosciences, January, 221-35. https://njgjournal.nl/index.php/njg/article/view/12898.