Trouvelot, L., « Undulations observed in the tail of Coggia's comet, 1874 », Proceedings of the American Academy of Arts and Sciences, vol. 13, , p. 185–186 (lire en ligne)
books.google.com
Haydn's Dictionary of Dates and Universal Information, NY, Harper and Brothers, (lire en ligne), « Coggia's Comet », p. 175 To the casual observer near London the comet became readily visible about July 4th.
"The Voyage of the F. H. Moore" and Other 19th Century Whaling Accounts, (lire en ligne), p. 60 According to Samuel Grant Williams’s journal entry for July 10, 1874, “… About the 3d this month we began to see a beautiful comet in the southern sky. It has been visible every night since. We see it a little after sundown and about midnight it fades from sight.…” Williams’s whaling ship (under the command of Captain Soper) might have been near 24.22°N, 85.40°W.
Kronk, G. W., Cometography : A Catalog of Comets, vol. Volume 2: 1800–1899, Cambridge University Press, , 405–412 p. (ISBN0-521-58505-8, lire en ligne), « C/1874 H1 (Coggia) »
Seargent, David A. J., The greatest comets in history, (lire en ligne), « C/1874 H1 (Coggia) », p. 126
Moore, P. et Rees, R., Patrick Moore’s Data Book of Astronomy, Cambridge, Cambridge University Press, (ISBN978-0-521-89935-2, lire en ligne), « Table 14.8 Selected list of brilliant comets, 1500–1900 », p. 270
Hayter, Henry Heylyn, Victorian Year Book for 1874, (lire en ligne), « Alleged sightings near Melbourne », p. 226 "July 26.—Coggia's comet first seen in Victoria from Wilson's Promontory, Point Lonsdale, and the suburbs of Melbourne."
« Comet Coggia », The Astronomical Register, no 140, , p. 183–193 (lire en ligne)
David H. Levy: Poet and Observer: Gerard Manley Hopkins and some mid-19th Century Comets. In: Journal of the Royal Astronomical Society of Canada. Vol. 75, No. 3, 1981, pp. 139–150. (PDF; 974 kB).
hathitrust.org
babel.hathitrust.org
A. Guillemin, trans. & ed. by J. Glaisher, The world of comets, Londres, (lire en ligne), « Comet observed by R. L. J. Ellery », p. 353
