International Union for Conservation of Nature and Natural Resources. Ethics Working Group. Conference on Conservation and Development: Implementing the World Conservation Strategy Ottawa, Ont., Engel, J. G., Engel, J. R., & Petersen, J. D. (1993). Ethics of environment and development: A global challenge, international response. University of Arizona Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Union for Conservation of Nature and Natural Resources. Ethics Working Group. Conference on Conservation and Development: Implementing the World Conservation Strategy Ottawa, Ont., Joan Gibb Engel, J. Ronald Engel, και John D. Petersen. Ethics of Environment and Development: A Global Challenge, International Response. Tucson: University of Arizona Press, 1993.
Παραπομπή σε μορφή MLA (8th εκδ.)International Union for Conservation of Nature and Natural Resources. Ethics Working Group. Conference on Conservation and Development: Implementing the World Conservation Strategy Ottawa, Ont., et al. Ethics of Environment and Development: A Global Challenge, International Response. University of Arizona Press, 1993.
