Suwandi, S., Yunus, A., & Rahmawati, L. E. (2018). The Effectiveness of Ecological Intelligence-Based Indonesian Language Textbooks on the Environmentally Friendly Behaviors of State Junior High School Students in Surakarta. KnE Social Sciences, 3(9), 261–267. https://doi.org/10.18502/kss.v3i9.2687