CLAY, JOHN, My Life on The Range. Privately printed, Chicago, 1924.
HAGEDORN, HERMAN, Roosevelt in the Badlands. Houghton Mifflin Company, Boston and New York, 1921.
HAGEN, OLAF T., and MATTISON, RAY H., "Pyramid ParkWhere Roosevelt Came to Hunt." North Dakota History, Vol. 19, No. 4 (October 1952).
KINGSBURY, GEORGE W., History of Dakota Territory, 3 v. The S. J. Clarke Publishing Company, Chicago, 1915.
LANG, LINCOLN ALEXANDER, Ranching with Roosevelt. J. B. Lippincott Company, Philadelphia and London, 1926.
MATTISON, RAY H., "Ranching in The Dakota Badlands." North Dakota History, Vol. 19, Nos. 2 and 3 (April and July 1952).
______ , "Roosevelt and the Stockgrowers Association." North Dakota History, Vol. 17, Nos. 2 and 3 (April and July 1950).
MORISON, ELTING, Letters of Theodore Roosevelt, Vol. I and II (1868-1900). Harvard University Press, 1951.
OSGOOD, ERNEST S., The Day of the Cattleman. University of Minnesota Press, Minneapolis, 1954.
PELZER, LOUIS, The Cattleman's Frontier. Arthur H. Clark Co., Glendale, 1936.
PRINGLE, HENRY FOWLES, Theodore Roosevelt, A Biography. Hancourt, Brace and Company, New York, 1931.
ROOSEVELT, THEODORE, Theodore Roosevelt, An Autobiography. Charles Scribner's Sons, New York, 1920.
______ , Hunting Trips of a Ranchman. G. P. Putnam's Sons, New York and London, 1922.
______ , Ranch Life and the Hunting Trail. Century Company, New York, 1899.
SEWALL, WILLIAM WINGATE, Bill Sewall's Story of T. R. Harper & Brothers, New York and London, 1919.
Note: Many of these books are out of print but they may be available from a library.