Dewa Putu Purnawan , Sasmito Sukarna , Ery Setiawan. “Evaluation of Drainage Systems in Sekarbela Area and Its Surroundings”. International Journal of Emerging Trends in Science and Technology, Vol. 5, no. 11, Nov. 2018, pp. 6745-51, http://igmpublication.org/ijetst.in/index.php/ijetst/article/view/1277.