Edi, Susanto and Suranten, . (2014) IMPROVING THE STUDENTS’ CONFIDENCE IN LEARNING MATHEMATICS THROUGH PROBLEM BASED LEARNING. Proceeding of International Conference On Research, Implementation And Education Of Mathematics And Sciences 2015 (ICRIEMS 2015), Yogyakarta State University, 17-19 May 2015. ISSN 978-979-96880-8-8