Castle, Hearst (November 15, 2012). "George Hearst - Hearst Castle". hearstcastle.org. Archived from the original on March 23, 2024. Retrieved July 2, 2024.
Richards, Susan L. "Library Philanthropy with a Personal Touch: Phoebe Apperson Hearst and the Libraries of Lead and Anaconda," Libraries & Culture, Vol. 31, No. 1, (University of Texas Press, 1996): 197-208.
JSTOR25548430
Castle, Hearst (November 15, 2012). "George Hearst - Hearst Castle". hearstcastle.org. Archived from the original on March 23, 2024. Retrieved July 2, 2024.