Dr. Seuss1904–1991- On writing for adults, as quoted in Of Sneetches and Whos and the Good Dr. Seuss: Essays on the Writings and Life of Theodor Geisel (1997) by Thomas Fensch, p. 96
- Statement about children, as quoted in Enter, Conversing (1962) by Clifton Fadiman, p. 108
- Horton Hears a Who! (1954)





