Suwandi, S, A Yunus, and L E Rahmawati. 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.