APA
Duns Scotus I., Roche E., . (1949). The De primo principio of John Duns Scotus. St. Bonaventure (N.Y.): Franciscan Institute.
Chicago
Duns Scotus Iohannes, Roche Evan, . 1949. The De primo principio of John Duns Scotus. St. Bonaventure (N.Y.): Franciscan Institute.
Harvard
Duns Scotus I., Roche E., . (1949). The De primo principio of John Duns Scotus. St. Bonaventure (N.Y.): Franciscan Institute.
MLA
Duns Scotus Iohannes, Roche Evan, . The De primo principio of John Duns Scotus. St. Bonaventure (N.Y.): Franciscan Institute. 1949.
TextLanguage: English, Latin Series: Franciscan Institute publications. Philosophy series ; 005Publication details: St. Bonaventure (N.Y.) : Franciscan Institute ; Louvain : É. Nauwelaerts, 1949.Description: xvii, 153 p. ; 23 cmOther classification: 
Opera (Magaz.)