BudianaD. R., MuharamA., dan Hikamudin M. I. “Utilization of Waste Through Ecoliteration Approaches Based on High-Thinking Skill in Elementary School”. International Conference on Elementary Education, Vol. 2, no. 1, Maret 2020, hlm. 1417-2, http://proceedings2.upi.edu/index.php/icee/article/view/769.