Mohammad Ramdan Zakaria, et al. “IMPROVING STUDENT’S INTEREST AND LEARNING OUTCOMES THROUGH THEN INQUIRY APPROACH IN IPS LESSONS ON NATURAL AND MANUFACTURED VIEWS MATERIALS IN INDONESIA IN CLASS V SDN 8 BONE, BONE BOLANGO REGENCY”. International Journal of Innovations in Engineering Research and Technology, vol. 7, no. 12, Dec. 2020, pp. 236-45, https://repo.ijiert.org/index.php/ijiert/article/view/2892.