Umbara, Uba, Wahyudin Wahyudin, and Sufyani Prabawanto. “How to Predict Good Days in Farming: Ethnomathematics Study With an Ethnomodelling Approach”. JRAMathEdu (Journal of Research and Advances in Mathematics Education) 6, no. 1 (January 23, 2021): 71–85. Accessed November 17, 2025. https://journals2.ums.ac.id/jramathedu/article/view/9345.