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.
芝加哥风格引文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.
MLA引文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.
警告：这些引文格式不一定是100％准确.