Beyer, Landon, E., "William Heard Kilpatrick", Prospects, Parijs, UNESCO, International Bureau of Education, 27 (3), 1997, p. 470-485. Gearchiveerd op 2 september 2012.
Beyer, Landon, E., "William Heard Kilpatrick", Prospects, Parijs, UNESCO, International Bureau of Education, 27 (3), 1997, p. 470-485. Gearchiveerd op 2 september 2012.