Ruyani, R, and A Herlambang. “The Contribution of Socio-Economic Institution of Citarum Community to The Spring Conservation Effort”. Proceeding Interuniversity Forum for Strengthening Academic Competency, vol. 1, no. 1, May 2019, pp. 361-6, https://proceedings.conference.unpas.ac.id/index.php/ifsac/article/view/188.