Nafilah, N and Dwi Yulianti, DY and Riswandi, Riswandi The Development of the Thematic Student Worksheets (LKPD) Based On Cooperative Learning to Improve Collaborative Skills of Students. IOSR journal of research & Method in education (IOSR-JRME), 12 (1). pp. 17-27. ISSN 2320-7388