Napitupulu, Efendi, Hamonangan Tambunan, and Nono Sebayang. “Development of Textbooks Based on Local Wisdom for Character Building of Elementary Education Students”. International Journal of Advanced Engineering, Management and Science 7, no. 1 (January 30, 2021). Accessed December 5, 2024. https://journal-repository.com/index.php/ijaems/article/view/3092.