Title: Buffalo Nickels, 1913-1938, Author: Whitman Coin Book and Supplies
Title: Statehood Quarters, Author: Staff of Whitman Publishing
Title: Official U.S. Mint 50 State Quarters 1999-2008, Author: Whitman Publishing
Title: State Series Quarters 1999-2009 Collectors Map (Gray Fold), Author: H. E. Harris
Title: A Guide Book of United States Coins 2012, Author: R. S. Yeoman
Title: Handbook of United States Coins 2014, Author: R.S. Yeoman