Grauerholz, James. The Death of Joan Vollmer Burroughs: What Really Happened? American Studies Department, University of Kansas. Online.Arkiveret 19. januar 2012 hos Wayback Machine
Grauerholz, James. The Death of Joan Vollmer Burroughs: What Really Happened? American Studies Department, University of Kansas. Online.Arkiveret 19. januar 2012 hos Wayback Machine