Tweed, W. C. (2010). Uncertain path: A search for the future of national parks. University of California Press.
芝加哥风格引文Tweed, William C. Uncertain Path: A Search for the Future of National Parks. Berkeley: University of California Press, 2010.
MLA引文Tweed, William C. Uncertain Path: A Search for the Future of National Parks. University of California Press, 2010.
警告：这些引文格式不一定是100％准确.