Lenny Yusrini , Maeenuddin , Muhammad Salman Chughtai , Muhammad Hafeez , Nova Eviana. 2020. “Environmental Education Program Based on the Perception and Preference towards the Environment for Elementary School Children”. International Journal of Advanced Science and Technology 29 (8s), 3394-3406. http://sersc.org/journals/index.php/IJAST/article/view/16631.