Apuntes biográficos/históricosJohn Vernon. Archivero del United States National Archivies, College Park, Maryland.
Fuentes consultadas1. McCullagh, David. John A. Costello The Reluctant Taoiseach. A Biography, 2011 of John A. Costello (John Vernon, United States National Archivies, College Park, Maryland)
2. Vernon, John A., Wood, Richard E. Baseball, Bubble Gum And Business : The Making Of An Archives Exhibit, 1985