Alsberg, H. G. (ed.), 1949. The American Guide. New York: Hastings House.

Butko, Brian and Kevin Patrick, 1999. Diners of Pennsylvania. Mechanicsburg, PA: Stackpole Books.

Hokanson, Drake, 1988. The Lincoln Highway: Main Street Across America. Iowa City: University of Iowa Press.

Jakle, John A. and Keith A. Sculle, 1994. The Gas Station in America. Baltimore: The Johns Hopkins University Press

Jakle, John A., Keith Sculle, and Jefferson S. Rogers, 1996. The Motel in America. Baltimore: The Johns Hopkins University Press.

Moore, Bob and Patrick Grauwels, 1994. Route 66: A Guidebook to the Mother Road. Motorbooks.

Stewart, George, 1953. U. S. 40; Cross Section of the United States of America. Boston: Houghton Mifflin Co.

Weingroff, Richard, 1987. Notes on Route 6 from the Federal Highway Commission. An updated version, U. S. Route 6 - The Grand Army of the Republic Highway, is on the Web: 
Other Route 6 Web Sites
U. S. Route 6 Tour Association: