Najmawati, Sudarman, and M. Rizal, “The Application of Coopeartif Learning Model type STAD Assisted with Broad Transparent Diagrams, Alva board and Circle models to Improve Student Learning Outcomes on Broadly Simple Facets and Circles in Class VIA at SDN 15 Palu”, J. Riset Pend. MIPA, vol. 1, no. 1, pp. 17-30, Jun. 2017.