Den Bok, Nico. 2000. “Freedom in Regard to Opposite Acts and Objects in Scotus’ Lectura I 39, pp. 45-54.”Vivarium 38(2): 243–254.
Den Bok, Nico, Baç, Murat, Boc, M., Beck, A. J., Bom, K., Dekker, Eef, Labooy, Guus H., Veldhuis, H. and Vos, Antonie. 2008. “More than just an individual: Scotus’s Concept of Person from the Christological Context of Lectura III 1.”Franciscan Studies 66: 169–196.