Anderson, David D. Ignatius Donnelly. Boston: Twayne, 1980.
DeMeules, Donald H. Ignatius Donnelly: A Don Quixote in the World of Science." Minnesota History 37 (June 1961): 229-34.
Doermann, Humphrey. All My Immense Labor For Nothing..." American Heritage 12 (June 1961): 60-64+.
Donnelly, Ignatius. The American Peoples Money. Chicago: Laird & Lee, 1895, No. 141 of The Pastime Series. Reprint, Westport, Conn.: Hyperion Press, 1976.
. Atlantis: The Antediluvian World. New York: Harper & Brothers, 1882. Reprint, [Alexandria, VA]: Time-Life Books, 1991.
. Caesars Column: A Story of the Twentieth Century. Chicago: F. J. Schulte & Company, . Reprint, introduced and edited by Nicholas Ruddick. Middletown, Conn.: Wesleyan University Press, 2003.
. The cipher in the plays, and on the tombstone. London: S. Low, Marston & Company Limited, .
. Contested election of Donnelly vs. Washburn. [N.p., 1879].
. The Destruction of Atlantis: Ragnarok, or, The Age of Fire and Gravel. New York: D. Appleton, 1883. Reprint, Mineola, N.Y.: Dover Publications, 2004.
. Doctor Huguet. 1891. Reprint, New York: Arno Press, 1969.
. Donnelliana. Chicago: F. J. Schulte & Company, .
. Freedmans Bureau: Speech of Hon. Ignatius Donnelly of Minnesota, delivered in the House of Representatives, February 1, 1866. [Washington: McGill & Witherow, 1866].
. The Golden Bottle. 1892. Reprint, with a new introduction by David W. Noble. New York: Johnson Reprint Corp., 1968.
. The Great Cryptogram: Francis Bacons Cipher in the So-called Shakespeare Plays. London: S. Low, Marston, Searly & Rivington, 1888. Reprint, St. Clair Shores, Mich.: Scholarly Press, 1972.
. Ignatius Donnelly Papers, 1812-1943. Helen M. White, editor. [St. Paul]: Minnesota Historical Society, 1966.
. Nininger City: A Pamphlet. Philadelphia: Duross, 1856.
. Ragnarok: The Age of Fire and Gravel. New York, D. Appleton and Company, 1883. Reprint, introduction by Leslie Shepard. New York: University Books, .
. Reform of the Indian system. [Washington: Towers, printer, 1865].
. The Shakespeare myth. [N.p., 1887?]
Hicks, John D. The Political Career of Ignatius Donnelly." Mississippi Valley Historical Review 8 (June 1921): 80-132.
. Speech of Hon. Ignatius Donnelly of Minnesota in favor of the Northern Pacific Railroad: Delivered in the House of Representatives, April 26, 1866. [Washington: Congressional Globe Office, 1866].
. A Tribute to Lincoln. [N.p., 1942].
Kennedy, Roger G. Ignatius Donnelly and the Politics of Discontent; An Inquiry Into the Career of a Populist." American West 6 (March 1969): 10-14+.
Nydahl, Theodore L. The Diary of Ignatius Donnelly, 1859-1884." Ph.D. diss., University of Minnesota, 1942.
Peterson, Larry Richard. Ignatius Donnelly: A Psychohistorical Study in Moral Development Psychology." Ph.D. diss., University of Minnesota, 1977.
Pyle, Joseph Gilpin. The little cryptogram: A literal application to the play of Hamlet of the cipher system of Mr. Ignatius Donnelly. Saint Paul: The Pioneer Press Co., 1888.
Ridge, Martin. Ignatius Donnelly; The Portrait of a Politician. With a New Preface by the Author. 1962. Reprint, St. Paul: Minnesota Historical Society Press, 1991.
. Ignatius Donnelly and the Granger Movement in Minnesota." Mississippi Valley History Review 42 (March 1956): 693-709.
. Ignatius Donnelly and the Greenback Movement." Mid-America 39 (July 1957): 156-68.
Wack, Henry Wellington. Personal Recollections of a Great Baconian, Hon. Ignatius Donnelly. N.p.: Bacon Society of America, .
Warren, Sidney. Ignatius Donnelly and the Populists." Current History 28 (June 1955): 336-42.
White, Helen McCann. Guide to a Microfilm Edition of the Ignatius Donnelly Papers. St. Paul: Minnesota Historical Society, 1968.