Guerric of Saint-Quentin -1245.
Quaestiones de quolibet /
Guerric of Saint-Quentin ; a critical edition by Walter H. Principe ; with editorial revision and a preface by Jonathan Black ; introduction by Jean-Pierre Torrell 
. - Toronto : Pontifical Institute of Mediaeval Studies,  2002 
. - xxxv, 462 p.  24 cm. 
 - Studies and texts  143 .
<br/><label>  ISBN: </label>0-88844-143-6