Norm Flayderman Flayderman's Guide to Antique American Firearms and Their Values, pg. 192-206, F+W Media, Inc, Dec 17, 2007
William Foster-Harris The Look of the Old West, Skyhorse Publishing Inc., 2007, pg. 66 - 69, accessed via google books, https://books.google.com/books?id=sNRk506pOZIC&pg=PA67#v=snippet&q=sharps&f=false (accessed 07/05/2015)
"Sharps Rifle Manufacturing Company," Wikipedia, https://en.wikipedia.org/wiki/Sharps_Rifle_Manufacturing_Company (accessed 07/05/2015) [unvetted]