Alistair Cameron Crombie: . Oxford: Clarendon Press 1953, ISBN 0-19-824189-5 Richard C. Dales: , in: Isis 52 (1961), 381-402. John Flood (utg.): . Pontifical Institute of Mediavel Studies, Toronto 2013. ISBN 978-0-88844-824-8 G. V. Lechler: Leipzig 1867. James McEvoy: , Oxford: Oxford University Press 2000. James McEvoy: 1994 James McEvoy: , Oxford: Clarendon Press 1986. Steven P. Marrone: : New Ideas of Truth in the Early Thirteenth Century, Princeton N.J.: Princeton University Press 1983. Richard Southern: : The Growth of an English Mind in Medieval Europe, Oxford: Clarendon Press 2. A. 1992.