Tanjung, I.F. et al. 2022. Application of Contextual Teaching And Learning Strategies to Improve Biology Learning Understanding on Ecosystem Materials at MAS YPRA Batang Kuis. Daengku: Journal of Humanities and Social Sciences Innovation. 2, 2 (Jun. 2022), 211–218. DOI:https://doi.org/10.35877/454RI.daengku888.