Marcus, Joseph C. (2007). “Forward-Scattering Enhancement of Comet Brightness. I. Background and Model”. International Comet Quarterly29 (2): 39–66. Bibcode: 2007ICQ....29...39M.
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Sarah R. Espy (1859–1868). “Private journal”. Alabama Department of Archives and History, Montgomery, Alabama. 2013年6月16日時点のオリジナルよりアーカイブ。2013年5月8日閲覧。
Donald K. Yeomans (April 2007). “Great Comets in History”. Jet Propulsion Laboratory/California Institute of Technology (Solar System Dynamics). 2011年2月2日閲覧。
Diary of John R. Robinson, Feb 14 to Sept 15, 1861: His journey to Batopilas, Mexico in Inspect Silver Mines, with a View to Purchase. http://www.torski.com/family/jrrobinson/pgjrr1stdiarymain.htm. Also located in the Huntington Library, San Marino, California.
