VAN DER FLIER-KELLER, Eileen; CLINTON, Laura; HAIDL, Fran. EdGEO: Helping Teachers Teach Earth Science. Geoscience Canada, [S. l.], v. 36, n. 3, 2009. Disponível em: https://journals.lib.unb.ca/index.php/GC/article/view/12597. Acesso em: 19 may. 2025.