Middleton, J., & Waltham, T. (1992). The underground atlas: A gazetteer of the world's cave regions. Promotional Reprint Company.
芝加哥风格引文Middleton, John, 与 Tony Waltham. The Underground Atlas: A Gazetteer of the World's Cave Regions. Leiscester, Eng: Promotional Reprint Company, 1992.
MLA引文Middleton, John, 与 Tony Waltham. The Underground Atlas: A Gazetteer of the World's Cave Regions. Promotional Reprint Company, 1992.
警告：这些引文格式不一定是100％准确.