Purnama Putra, H. et al. 2014. Utilization of Human Urine as Fertilizer with Magnesium Oxide (MgO), Zeolite and Activated Carbon as Absorbent. International Journal on Advanced Science, Engineering and Information Technology. 4, 3 (Jun. 2014), 173–176. DOI:https://doi.org/10.18517/ijaseit.4.3.395.