Syahidah, U., F. Umasugi, and Z. Buamona. “A Design of English Immersion Camp for Supplementing English Teaching and Learning in Indonesia”. ELS Journal on Interdisciplinary Studies in Humanities, vol. 2, no. 1, Mar. 2019, pp. 102-9, doi:10.34050/els-jish.v2i1.6227.