SAPUTRA, Jusep; ADITYA, Chandra. Problem-Based Introduction (PBI) Learning Model on The Problem Solving Ability of Prospective Economy Teachers. OIKOS: Jurnal Kajian Pendidikan Ekonomi dan Ilmu Ekonomi, [S.l.], v. 3, n. 1, p. 1-8, feb. 2019. ISSN 2549-2284. Available at: <http://journal.unpas.ac.id/index.php/oikos/article/view/1387>. Date accessed: 17 july 2019. doi: http://dx.doi.org/10.23969/oikos.v3i1.1387.