Nanik Yuliati2, Labibah Nilna Faizah1 , Susanto1 ,. 2017. “The Analyzing of Student’s Lateral Thinking Process in Solving Open Ended Probem of Rectangular and Square Material”. International Journal of Social Sciences and Humanities Invention 4 (8):3840-43. https://doi.org/10.18535/ijsshi/v4i8.25.