"Frederick Gutekunst". "Scenes from the Battle-Field at Gettysburg, PA." Special Collections, Gettysburg College. Archived from the original on December 7, 2015. Retrieved November 26, 2015.
civilwarphotography.org
"CCWP". Center for Civil War Photography, John Richter's 3-D Anaglyph Photographs Exhibit. Archived from the original on November 16, 2015. Retrieved November 24, 2015.
"Singing the Praises of David Knox". by Craig Heberton IV and Keith B.C. Brady – Center for Civil War Photography "Battlefield Photographer" – August 2018 issue. Retrieved October 6, 2018.
"George N. Barnard". published work at the Library of Congress P&P. Retrieved November 30, 2015.
"Timothy O'Sullivan". published work at the Library of Congress P&P. Retrieved December 2, 2015.
"James F. Gibson". published work at the Library of Congress. Retrieved November 24, 2015.
"Andrew J. Russell". Early Alexandria studies, Library of Congress P&P, LOT 9209. Retrieved November 28, 2015.
"Andrew J. Russell". United States Military Rail Road Photographic Album, A.J. Russell, Artist Library of Congress P&P, LOT 4336. Retrieved November 28, 2015.
"Andrew J. Russell". published work @ Library of Congress P&P. Retrieved November 28, 2015.
"Thomas C. Roche". published work at the Library of Congress P&P. 1865. Retrieved December 7, 2015.
"Jacob Coonley". "negatives at the Library of Congress P&P. Retrieved November 25, 2015.
"William E. James' photo". The flag actually being raised inside Fort Sumter, Library of Congress P&P. Retrieved November 30, 2015.
"Sam Cooley". "published work at the Library of Congress P&P. Retrieved November 25, 2015.
"George Cook". published works at the Library of Congress P&P. Retrieved November 24, 2015.
"Osborn & Durbec". published works at the Library of Congress P&P, including the recently (2015) acquired, Robin Stanford Collection. Retrieved November 24, 2015.
"Timothy H. O'Sullivan". Framing the West The Survey Photographs of Timothy H. O'Sullivan – Smithsonian American Art Museum and the Library of Congress. Archived from the original on December 8, 2015. Retrieved December 2, 2015.
web.archive.org
"CCWP". Center for Civil War Photography, John Richter's 3-D Anaglyph Photographs Exhibit. Archived from the original on November 16, 2015. Retrieved November 24, 2015.
"Timothy H. O'Sullivan". Framing the West The Survey Photographs of Timothy H. O'Sullivan – Smithsonian American Art Museum and the Library of Congress. Archived from the original on December 8, 2015. Retrieved December 2, 2015.
"Frederick Gutekunst". "Scenes from the Battle-Field at Gettysburg, PA." Special Collections, Gettysburg College. Archived from the original on December 7, 2015. Retrieved November 26, 2015.
