Bernice E. Cullinan et Diane Goetz Person, The Continuum Encyclopedia of Children's Literature (reprint), A&C Black, , 863 p. (ISBN978-0-8264-1778-7, lire en ligne), p. 784
Ann Christine Clark, Historical Fiction for Children and Young People : changing fashions, changing forms, changing representations in British writing 1934‐2014, PHD Thesis for Newcastle University, , 40-41 p. (lire en ligne)