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Goris, Wouter, Speer, Andreas and Steel, Carlos (2015). In memoriam Jan A. Aertsen. Bulletin de philosophie médiévale, 57. pp. 549-555. Turnhout: Brepols. ISSN 0068-4023
Helmig, Christoph and Steel, Carlos (2020). Proclus. In: The Stanford Encyclopedia of Philosophy (Summer 2020 Edition), Stanford: University Press.
Speer, Andreas (2003). Certitude and Wisdom in Bonaventure and Henry of Ghent. In: Henry of Gent and the Transformation of Scholastic Thought. Studies in Memory of Jos Decorte, pp. 75-100. Leuven: University Press. ISBN 90-5867-329-4
Speer, Andreas (2005). Lectio physica. Anmerkungen zur Timaios-Rezeption im Mittelalter. In: Platons Timaios als Grundtext der Kosmologie in Spätantike, Mittelalter und Renaissance, pp. 213-234. Leuven: Univ. Press. ISBN 978-90-5867-506-4
Speer, Andreas (2000). The Vocabulary of Wisdom and the Understanding of Philosophy. In: L'élaboration du vocabulaire philosophique au Moyen Age, pp. 257-280. Turnhout: Brepols. ISBN 978-2-503-51117-7