Rabbani, et al. “The Influence of Extension of Community Knowledge in Making Slate Sand Filters in the Residents of Napabale Ii Housing, Poasia Sub-District, Poasia District, Kendari City South Sulawesi Province Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 51, no. 1, Apr. 2020, pp. 178-84, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/10958.