Riyanti, E. D. (2017) “The Earth Day Every Day Project: Environmental Education as Hidden Curriculum in Language Learning”, Cendekia: Jurnal Kependidikan dan Kemasyarakatan, 15(1), pp. 1–20. Available at: https://jurnal.iainponorogo.ac.id/index.php/cendekia/article/view/849 (Accessed: 17 August 2025).