International Union for Conservation of Nature and Natural Resources & IUCN Commission on National Parks and Protected Areas. (1990). Parks. Science and Technology Letters, in association with IUCN's Commission on National Parks and Protected Areas.
Citazione stile Chigago Style (17a edizione)International Union for Conservation of Nature and Natural Resources e IUCN Commission on National Parks and Protected Areas. Parks. Northwood, UK: Science and Technology Letters, in association with IUCN's Commission on National Parks and Protected Areas, 1990.
Citatione MLA (8a ed.)International Union for Conservation of Nature and Natural Resources e IUCN Commission on National Parks and Protected Areas. Parks. Science and Technology Letters, in association with IUCN's Commission on National Parks and Protected Areas, 1990.