Harris, D. V. (1980). The geologic story of the national parks and monuments (3rd ed.). Wiley.
芝加哥风格引文Harris, David V. The Geologic Story of the National Parks and Monuments. 3rd ed. New York ; Chichester: Wiley, 1980.
MLA引文Harris, David V. The Geologic Story of the National Parks and Monuments. 3rd ed. Wiley, 1980.
警告：这些引文格式不一定是100％准确.