Environmental education : an approach to sustainable development = L'Éducation environnementale : approches pour un développement durable / edited by Hartmut Schneider in co-operation with Jacoline Vinke and Winifred Weekes-Vagliani - Vinke, Jacoline; Weekes-Vagliani, Winifred; Schneider, Hartmut (OECD documents, 1993)