Leigh, Eric Schmidt (1997). Princeton University Press (ed.). Consumer Rites: The Buying and Selling of American Holidays (reprint, illustrated ed.). Princeton University Press. pp. 252, 348 (footnote 17 of chapter 5). ISBN0-691-01721-2. citing Deborah Pickman Clifford, Mine Eyes Have Seen the Glory: A Biography of Julia Ward Howe (Boston: Little, Brown, 1979), 187, 207, and Julia Ward Howe, "How the Fourth of July Should Be Celebrated", Forum 15 (July 1983); 574
Virginia Bernhard (2002). "Mothers' Day". In Joseph M. Hawes, Elizabeth F. Shores (ed.). The family in America: an encyclopedia (3, illustrated ed.). ABC-CLIO. p. 714. ISBN1-57607-232-0.
Richards, Laura Elizabeth Howe; Elliott, Maud Howe; Hall, Florence Howe (January 1, 1915). "Julia Ward Howe, 1819–1910". Houghton Mifflin – via Google Books.