International Union for Conservation of Nature and Natural Resources & Goudswaard, J. (1972). Environmental education in an urban society: Proceedings of the ninth regional conference of the North-West Europe Committee ... held at Rotterdam ... 1971. International Union for Conservation of Nature and Natural Resources.
Chicago-Zitierstil (17. Ausg.)International Union for Conservation of Nature and Natural Resources und J. Goudswaard. Environmental Education in an Urban Society: Proceedings of the Ninth Regional Conference of the North-West Europe Committee ... Held at Rotterdam ... 1971. Morges: International Union for Conservation of Nature and Natural Resources, 1972.
MLA-Zitierstil (8. Ausg.)International Union for Conservation of Nature and Natural Resources und J. Goudswaard. Environmental Education in an Urban Society: Proceedings of the Ninth Regional Conference of the North-West Europe Committee ... Held at Rotterdam ... 1971. International Union for Conservation of Nature and Natural Resources, 1972.