F. Vhantoria, Ningrum and Purna, Bayu Nugroho and Ika, Wulandari  (2015) THE INTEGRATION OF HISTORY, TECHNOLOGY, ENGINEERING, ART, AND SCIENCE INTO TRIGONOMETRY OF SENIOR HIGH/VOCATIONAL MIDDLE SCHOOL.  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