Fauziah, Anna, Ratu Ilma Indra Putri, Zulkardi, and Somakim. 2020. “Developing PMRI Learning Environment through Lesson Study for Pre-Service Primary School Teacher”. Journal on Mathematics Education 11 (2):193-208. http://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3666.