RIYANTI, Erni Dewi. The Earth Day Every Day Project: Environmental Education as Hidden Curriculum in Language Learning. Cendekia: Jurnal Kependidikan dan Kemasyarakatan, [S. l.], v. 15, n. 1, p. 1–20, 2017. Disponível em: https://jurnal.iainponorogo.ac.id/index.php/cendekia/article/view/849. Acesso em: 17 aug. 2025.