The following publications contain information about Marcus Henry Kellogg:

Article: "Lounsberry's Famous News Scoop, Custer Massacred" by Louise Cheney • Real West • Vol. VII, No. 37 • September 1964.

Book: Custer's "Mysterious Mr. Kellogg" and the Diary of Mark Kellogg by John Hixon, State Historical Society of North Dakota, 1950.

Article: "North Dakota Comes into Its Own" by Leo A. Borah • The National Geographic Magazine • Volume C, Number Three, September 1951.

Article: "Tribune's 'mystery man' story called a myth" by Ted Quanrud • The Bismarck Tribune • Bismarck, North Dakota • Vol. 112, No. 198 • July 19, 1985

Article in Canadians with Custer in 1876 by Bernie Rosevear and Stephen Rosevear, Monroe County Library Sysytem, 1992.

Article: "Correspondent Mark Kellogg Was 'At the Death' on the Little Bighorn" by John Koster • Wild West Magazine • June 15, 2017 • https://www.historynet.com/correspondent-mark-kellogg-death-little-bighorn.htm • Accessed March 8, 2019.

Article: "Tribune's ex-editor was unorthodox" by Curtis Eriksmoen • Inforum • December 31, 2006 •https://www.inforum.com/news/tribunes-ex-editor-was-unorthodox • Accessed March 8, 2019.