WINARDI, S.; TOHA, B.; IMRON, M.; AMIJAYA, D. H. The Potential of Eocene Shale of Nanggulan Formation as a Hydrocarbon Source Rock. Indonesian Journal on Geoscience, [S. l.], v. 8, n. 1, p. 13–23, 2013. DOI: 10.17014/ijog.8.1.13-23. Disponível em: https://ijog.geologi.esdm.go.id/index.php/IJOG/article/view/152. Acesso em: 7 jun. 2025.