Coba jelasin Catatan dari George Crook dong

Aleshire, Peter, The Fox and the Whirlwind: General George Grook and Geronimo, Castle Books, 2000, .

Eicher, John H., and Eicher, David J., Civil War High Commands, Stanford University Press, 2001, .

Magid, Paul. George Crook: From the Redwoods to Appomattox (University of Oklahoma Press, 2011, ).

Magid, Paul. The Gray Fox: George Crook and the Indian Wars (2015) vol 2

Robinson, Charles M., III. "General Crook and the Western Frontier", Norman: University of Oklahoma Press, 2001.

Schmitt, Martin F., General George Crook, His Autobiography, University of Oklahoma Press, 1986 .

Warner, Ezra J., Generals in Blue: Lives of the Union Commanders, Louisiana State University Press, 1960-4, .