ISBN 9781258120832. ↑ King, David (2009), Herbert Hoover, Tarrytown, NY: Marshall Cavendish, ISBN 0-7614-3626-X ↑ Harper (1996), 14. ↑ Coker (2005), 4. ↑ Harper (1996), 17. ↑ Coker (2005), 6. ↑ Freedman (1992), 9. ↑ 96 - Address in Quebec, Canada ↑ Poser, Bill (8 July 2007).