Samara, Nengsi, Aksamina M Yohanita, and Iwan Iwan. 2018. “Application of Problem-Solving Learning Models to Improve the Activity and students’ Learning Outcomes of SMA Kristen YABT Manokwari”. Inornatus: Biology Education Journal 1 (1):30-41. https://doi.org/10.30862/inornatus.v1i1.38.