| Afton, Jean. "The Dog Soldier Artists Plains Indian Ledger Drawings". The Clarion 14 ( Fall 1989): 52-57.|
Afton describes the "Dog Soldier Ledger Book" held by the Colorado Historical Society. She comments on its provenance, ledger art in general and identifies the artists and their drawings in the ledger.
| Afton, Jean. "Techniques for Determining Dates Derived from a
Cheyenne Indian Sketchbook". Southwest Lore 43 ( June 1977): 11-31.|
In this article, Afton attempts to date the encounters and events represented in a Cheyenne Indian sketchbook captured in an 1869 raid on a Cheyenne camp. Afton refers to this book as the Summit Springs ledger. It is in the Colorado Historical Society.
| Alexander, Hartley B. Sioux Indian Painting. Part 1, Paintings of the
Sioux and Other Tribes. Nice, France: C. Szwedzicki, 1938. 15p.|
Part 1 is Alexander's introduction to twenty-five color reproductions of Sioux, Mandan, Shoshoni, and Kiowa ledger-type art. The artists included are Kills Two, Amos Bad Heart Buffalo, Chief Washakie, Charles Washakie, Katsikodi, and Silverhorn.
|Armstrong, William John. "Legacy of an Unlikely Friendship". Michigan History Magazine 79 ( January/February 1995): 28-35.|