Dwi, Astuti and Heri, Retnawati  (2014) COMPARISON OF THE EFFECTIVENESS OF CONSTRUCTIVISM AND CONVENTIONAL LEARNING KIT OF MATHEMATICS VIEWED FROM ACHIEVEMENT AND SELF CONFIDENCE OF STUDENTS IN VOCATIONAL HIGH SCHOOL (AN EXPERIMENTAL STUDY IN YEAR XI OF SMK MUHAMMADIYAH 2 YOGYAKARTA).  Seminar Nasional dan Temu Alumni "Peran Pendidikan dalam Pembangunan Karakter Bangsa".   ISSN 978-602-96172-6-9