Gaspersz, G. C. N. “Miocene Planktonic Foraminifera of Calcareous Sandstone Unit in Pamutuan Formation West Java, Indonesia”. Proceedings of the International Conference of Geological Engineering Faculty, vol. 1, no. 1, Aug. 2021, pp. 1-9, http://tiikmpublishing.com/proceedings/index.php/icgef/article/view/751.