For further information about tobacco and chewing gum baseball cards, please refer to these resources:
Appel, Martin & Burt Goldblatt. Baseball's Best: The Hall of Fame Gallery. New York: McGraw Hill, 1977.
Baseball-Reference.com. https://www.baseball-reference.com/ (accessed 4 February 2010).
Burdick, J. R. (ed.) The American Card Catalog: The Standard Guide on all Collected Cards and Their Values. Franklin, NY: Nostalgia Press, 1967.
Lipset, Lew. The Encyclopedia of Baseball Cards (Vols. 2-3). Centereach, NY: Lew Lipset, 1986.
Shatzkin, Mike (ed.). The Ballplayers: Baseball's Ultimate Biographical Reference. New York: Arbor House/William Morrow, 1990.