- The principal authority consulted in the preparation of this section is The Expeditions of Zebulon Montgomery Pike, edited by Dr. Elliott Coues, three volumes, Francis P. Harper, New York, 1895. It is one of the great authorities on Western history.
- The work next in importance is Discoveries made in Exploring the Missouri, Red River and Washita by Captains Lewis and Clark, Doctor Sibley, and Mr. Dunbar, Washington, 1806. This book contains much of value pertaining to the Western Indians of that day. The copy in the Library of the Kansas State Historical Society was once the property of John Randolph, of Roanoke.
- Kansas Historical Collections contain much on this subject, especially volumes X and XI. The articles by John B. Dunbar are of the highest order.
- For local information the History of Republic County, Kansas, is good authority for locations as now identified with the expedition of Pike. The book was written by I. O. Savage, and published at Beloit, Kansas, in 1901.
- The History of Vernon County, Missouri, by R. I. Holcomb, Brown & Co., St. Louis, Mo., 1887, contains much of value about the Osages in Pike’s time. It is one of the best of county histories.
- In addition to the above I consulted various local works and the extensive files in the Library of the Kansas State Historical Society.