Mawarti, Sela, Masrukan Masrukan, and Mohammad Asikin. “The Effectiveness of Problem Based Learning With Authentic Assessment towards Students’ Mathematical Problem Solving Ability at 11th Grade of Tran Nhan Tong Senior High School in Ho Chi Minh City, Vietnam”. Unnes Journal of Mathematics Education 7, no. 2 (August 31, 2018): 114-121. Accessed October 21, 2020. https://journal.unnes.ac.id/sju/index.php/ujme/article/view/21587.