Dienullah, R. M. A. ., F. K. Aini, F. Febriana, and F. Rosariawari. “PH (Phiezoelectric on Hydraulic Ram Pump) Media Supplier of Water and Producing Electrical Energy Environment Friendly”. Nusantara Science and Technology Proceedings, Apr. 2019, pp. 270-5, https://nstproceeding.com/index.php/nuscientech/article/view/112.