“Antibacterial Activity of Rhizome Extracts of Zingiber zerumbet (L.) Roscoeex Sm. Against Streptococcus pneumoniae: Aktivitas Antibakteri Ekstrak Rimpang Lempuyang Gajah (Zingiber zerumbet (L.) Roscoeex Sm.) Terhadap Bakteri Streptococcus pneumoniae” (2022) Procedia of Social Sciences and Humanities, 3, pp. 1007–1016. doi:10.21070/pssh.v3i.361.