R. Sihadi Darmo Wihardjo, Syahrul Ramadhan, Nurhalidah, Bangun Hutama Wardana. “Developing E-Module of Living Environment Education for Improving Environmental Awareness at Kindegarten”. International Journal of Advanced Science and Technology, Vol. 29, no. 04, June 2020, pp. 3285 -, http://sersc.org/journals/index.php/IJAST/article/view/24200.