Father Joseph Timothy O'Callahan, Richard J. Dowling S.J.
O'Callahan Science Library Narrative, College of the Holy Cross
Rev. J. T. O'Callahan, Hero-Priest, Is Dead, Catholic Free Press
USS O'Callahan (FF 1051) Decommissioning Ceremony, Joseph C. Strasser RADM
A Priestly Profile of the First Navy Chaplain to Receive the Medal of Honor, Ernest F. Passero S.J.