Tampubolon, Taruly, and Dr. Robert Harianja. “The Implementation of Guilford Learning Production Dimensions in Ninth Grade Students of SMP Negeri I Sipahutar Tapanuli Utara”. International Journal of Humanities and Education Development (IJHED) 2, no. 5 (October 31, 2020): 350–354. Accessed November 16, 2024. https://theshillonga.com/index.php/jhed/article/view/321.