CAULDWELL, H.; CAULDWELL, B. Happy Acres educational field centre. Southern African Journal of Environmental Education, [S. l.], v. 7, p. 30–31, 2016. DOI: 10.4314/sajee.v7i1.137477. Disponível em: https://www.ajol.info/index.php/sajee/article/view/137477. Acesso em: 9 oct. 2026.