International Union for Conservation of Nature and Natural Resources. Ethics Working Group, Conference on Conservation and Development: Implementing the World Conservation Strategy, Engel, J. R., & Engel, J. G. (1990). Ethics of environment and development: Global challenge, international response. Belhaven Press.
Цитирование в стиле Чикаго (17-е изд.)International Union for Conservation of Nature and Natural Resources. Ethics Working Group, Conference on Conservation and Development: Implementing the World Conservation Strategy, J. Ronald Engel, и Joan Gibb Engel. Ethics of Environment and Development: Global Challenge, International Response. London: Belhaven Press, 1990.
Цитирование MLA (9-е изд.)International Union for Conservation of Nature and Natural Resources. Ethics Working Group, et al. Ethics of Environment and Development: Global Challenge, International Response. Belhaven Press, 1990.