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Sarah R. Espy (1859–1868). "Private journal". Alabama Department of Archives and History, Montgomery, Alabama. Archived from the original on 16 June 2013. Retrieved 8 May 2013.
Donald K. Yeomans (April 2007). "Great Comets in History". Jet Propulsion Laboratory/California Institute of Technology (Solar System Dynamics). Archived from the original on 2020-04-11. Retrieved 2011-02-02.
Donald K. Yeomans (April 2007). "Great Comets in History". Jet Propulsion Laboratory/California Institute of Technology (Solar System Dynamics). Archived from the original on 2020-04-11. Retrieved 2011-02-02.
Tebbutt, John (1908). "evening of May 13, 1861". Astronomical Memoirs. Sydney. pp. 14–15. Archived from the original on May 13, 2022. Retrieved October 10, 2014.{{cite book}}: CS1 maint: location missing publisher (link)