Effendi, Effendi, Thoha Firdaus, and Erwin Erwin. “The Influence of Problem-Based Physics Learning Using Guided Inquiry Toward Scientific Attitude”. International Conference on Mathematics and Science Education of Universitas Pendidikan Indonesia 3 (December 1, 2018): 136-139. Accessed December 4, 2020. http://science.conference.upi.edu/proceeding/index.php/ICMScE/article/view/83.