Kirby-Smith, H. T. (1976). U.S. observatories: A directory and travel guide. Van Nostrand Reinhold.
芝加哥风格引文Kirby-Smith, H. T. U.S. Observatories: A Directory and Travel Guide. New York: Van Nostrand Reinhold, 1976.
MLA引文Kirby-Smith, H. T. U.S. Observatories: A Directory and Travel Guide. Van Nostrand Reinhold, 1976.
警告：这些引文格式不一定是100％准确.