* Tim Pat Coogan, ' 'Michael Collins" (1990, Hutchinson) (ISBN 0-09-174106-8)* T. Ryle Dwyer, "The Squad and the intelligence operations of Michael Collins", Dublin, 2005.
* Tim Pat Coogan, "Michael Collins" (1990, Hutchinson) (ISBN 0-09-174106-8)* T. Ryle Dwyer, "The Squad and the intelligence operations of Michael Collins", Dublin, 2005.