Anselm, St..
Proslogion with a Reply on Behalf of the Fool by Gaunilo and The Author's Reply to Gaunilo /
Translated with an Introduction and Philosophical Commentary by M.J. Charlesworth 
. - Notre  Dame; London : University of Notre Dame Press,  1978 
. - vi, 196 p.  21  cm. 
<br/><label>  ISBN: </label>0-268-01697-6