Novita, Dian, Didit Hadi Barianto, and Moch. Indra Novian. “Planktonic Foraminifera Biozonation of the Middle Eocene-Oligocene Kebo Formation, Kalinampu Area, Bayat, Klaten, Central Java”. Berita Sedimentologi 31, no. 1 (August 7, 2021): 70–81. Accessed October 31, 2026. https://journal.iagi.or.id/index.php/FOSI/article/view/125.