1. See Kusch 1995 and 1999.
2. Pluta 1987, 12–13. See Werner 1881a, 1881b, 1882. (Those three texts were republished in 1964 under the name Psychologie des Mittelalters.) Prior to those books, Werner had written about William of Auvergne’s, Bonaventure’s, John Duns Scotus’s and Roger
3. Bacon’s psychology, and about the development of the medieval psychology from Alcuin to Albert the Great. See Pluta 1987, 13, 159.
4. Siebeck 1888–1889, 1888–1890.
5. Siebeck 1897. In 1898 he briefly wrote about Ockham’s theory of the will in his article‘Die Willenslehre bei Duns Scotus und seinen Nachfolgern’ (pp. 195–199). Siebeck 1898.