Ranjit S. Dighe, The Historian's Wizard of Oz: Reading L. Frank Baum's Classic as a Political and Monetary Allegory (Westport, CT: Praeger, 2002)

Michael Patrick Hearn, The Annotated Wizard of Oz: Centennial Edition (New York: W.W. Norton and Company, Inc., 2000)

Martin Gardner and Russell B. Nye, eds., The Wizard of Oz and Who He Was (East Lansing: Michigan State University Press, 1994)

Richard Jensen, The Winning of the Midwest: Social and Political Conflict, 1885-1896 (Chicago: University of Chicago Press, 1971)

Gretchen Ritter, Goldbugs and Greenbacks: The Anti-Monopoly Tradition and the Politics of Finance in America (New York: Cambridge University Press, 1997)

Gene Clanton, Populism: The Humane Preference in America, 1890-1900 (Boston: Twayne Publishers, 1991)

William Leach, Land of Desire: Merchants, Power, and the Rise of a New American Culture (New York: Vintage Books, 1993)

Jack Weatherford, The History of Money: From Sandstone to Cyberspace (New York: Three Rivers Press, 1998)

Darren John Main, Spiritual Journeys Along the Yellow Brick Road (Tallahassee, FL: Findhorn Press, 2000)

Joey Green, The Zen of Oz: Ten Spiritual Lessons from Over the Rainbow (Los Angeles: Renaissance Books, 1998)

Jesse Stewart, Secrets of the Yellow Brick Road: A Map for the Modern Spiritual Journey (Hygrene, CO: Sunshine Press Publications, 1997)

Samuel Bousky, The Wizard of Oz Revealed (Weed, CA: Writers Consortium, 1994)

Paul Nathanson, Over the Rainbow: The Wizard of Oz as a Secular Myth of America (Albany: State University of New York Press, 1991)

Salman Rushdie, The Wizard of Oz (London: BFI Publishing, 1992)