World Conference on National Parks. 1st Seattle, 1962. (1962). First world conference on national parks; proceeding. National Park Service, U.S. Department of the Interior.
Citazione stile Chigago Style (17a edizione)World Conference on National Parks. 1st Seattle, 1962. First World Conference on National Parks; Proceeding. Washington: National Park Service, U.S. Department of the Interior, 1962.
Citatione MLA (9a ed.)World Conference on National Parks. 1st Seattle, 1962. First World Conference on National Parks; Proceeding. National Park Service, U.S. Department of the Interior, 1962.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.