MOEHAMMAD ALI JAMBAK, HIMMES FITRA YUDA, DEWI SYAVITRI, BENYAMIN, SURYA DARMA HAFIZ, FACHRY MUHAMMAD. Paleontology and Petrology of Late Paleozoikum Age in West Sumatera of Silungkang Formation. International Journal of Advanced Science and Technology, v. 29, n. 3, p. 6903 - 6911, 31 Mar. 2020.