William Bentley Ball. The Catholic University of America, The American Catholic History Research Center and University Archives.
Chicago-viite (17. p.)William Bentley Ball. The Catholic University of America, The American Catholic History Research Center and University Archives.
MLA-viite (8. p.)William Bentley Ball. The Catholic University of America, The American Catholic History Research Center and University Archives.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.