Genini, Ronald, and Richard Hitchman. Romualdo Pacheco: A Californian in Two Eras. San Francisco: Book Club of California, 1985.
Nicholson, Loren. Romualdo Pachecos California!: The Mexican-American Who Won. San Luis Obispo: California Heritage Publishing Associates, 1990.
Pacheco, Romualdo. The Nations Dead. Celebration of Memorial Day, Saturday, May 29, 1875, by the Grand Army of the Republic. Orations by Gov. Pacheco and Rev. Dr. [Frank F.] Jewell. San Francisco: Alta California Book and Job Printing House, 1875.
Ramirez, Anthony, Jr. Romualdo Pacheco, Governor of California. San Francisco: San Francisco Press, 1974.
Romualdo Pacheco" in Hispanic Americans in Congress, 1822-2012. Prepared under the direction of the Committee on House Administration by the Office of the Historian and the Office of the Clerk, U.S. House of Representatives. Washington: Government Printing Office, 1995.
Wigginton, Peter Dinwiddie. Contestants Brief and Argument in the Case of Wigginton Vs. Pacheco. Washington: R.O. Polkinhorn, printer, 1877.