George Gilmary Higgins. The Catholic University of America, The American Catholic History Research Center and University Archives.
Chicago Style (17. basım) AtıfGeorge Gilmary Higgins. The Catholic University of America, The American Catholic History Research Center and University Archives.
MLA (8th ed.) AtıfGeorge Gilmary Higgins. The Catholic University of America, The American Catholic History Research Center and University Archives.
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