PHOMMANITH , Khamsone, Vatsana KEOPHASITH, Oudom BOUSITH, Boy DOUNGCHAN, and Soulinthong SAYDUANGTA. 2020. “The Effect Of Problem-Based Learning Instruction Activities on Problem Solving Skills and Mathematical Connection Skills of Third Year Students”. Souphanouvong University Journal Multidisciplinary Research and Development 6 (2):104-12. http://www.su-journal.com/index.php/su/article/view/271.