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 -66, https://proceedings.conference.unpas.ac.id/index.php/ifsac/article/view/188.