Rachmi Andini, Cita, Hernani ., and Fitri Khoerunnisa. “Development of Teaching Materials and Concept Maps About the Relationship Between Sustainability and Chitosan for Water Treatment: Qualitative Content Analysis”. KnE Social Sciences 9, no. 13 (April 26, 2024): 172–181. Accessed May 20, 2024. https://knepublishing.com/index.php/KnE-Social/article/view/15917.