Kandungan Mineral dan Struktur Kristal Batu Sekis. Science and Physics Education Journal (SPEJ, [S. l.], v. 4, n. 1, p. 24–30, 2020. DOI: 10.31539/spej.v4i1.1513. Disponível em: https://journal.ipm2kpe.or.id/index.php/SPEJ/article/view/1513. Acesso em: 11 jan. 2026.