Iwakuma 1981:
'Instantiae: A Study of Twelfth Century Technique of Argumentation with an Edition of M. Paris BN lat. 6674 f. 1-5', Cahiers de l’Institut du Moyen-Age Grec et Latin 38 (1981), pp. 1-91.
Iwakuma 1983:
'Instantiae Revisited', Cahiers de l’Institut du Moyen-Age Grec et Latin 44 (1983), pp. 61-80.
Iwakuma 1987:
'Instantiae: An Introduction to a Twelfth Century Technique of Argumentation’, Argumentation 1 (1987), pp. 437-453.
Iwakuma 1989:
'Two More Instantia Texts', Zinbvn 24 (1989), pp. 13-88.
Iwakuma 1992a:
‘Vocales, or Early Nominalists’, Traditio 47 (1992), pp. 37-111.
Iwakuma 1992b:
‘Twelfth Century Nominales: The Posthumous School of Peter Abelard’, Vivarium 30 (1992), pp. 97-109.
Iwakuma 1992c:
‘Some Hither-to Unedited Texts on Logic in ms Wolfenbüttel, 56.20 Aug. 8o’, Journal of Fukui Prefectural University 1 (1992), pp. 1-28.
Iwakuma 1993a:
‘Parvipontani’s Thesis Ex impossibili quidlibet sequitur: Comments of the Sources from the Twelfth Century’, Argumentationstheorie: Scholastische Forschungen zu den logischen und semantischen Regeln korrekten Folgerns (ed. K. Jacobi), Leiden 1993, pp. 123-151.
Iwakuma 1993b:
‘The Introductiones dialecticae secundum Wilgelmum and secundum magistrum G. Paganellum’, Cahiers de l’institut du moyen-âge grec et latin 63 (1993), pp. 45-114.
Iwakuma 1993c:
‘The Fallaciae and Loci of William de Montibus: An Edition’, Journal of Fukui Prefectural University 2 (1993), pp. 1-44.
Iwakuma 1995:
‘Nominalia’, Didascalia 1 (1995), pp. 47-88.
Iwakuma 1996a:
‘The Realism of Anselm and his Contemporaries’, Anselm: Aosta, Bec and Canterbury (ed. D. Luscombe & G.R. Evans), Manchester Univ. Press 1996, pp. 120-135.
Iwakuma 1996b:
“Introductiones Duacenses in dialecticam: An Edition”, Veritas 15 (1996), pp. 21-35.
Iwakuma 1997:
‘Enuntiabilia in the 12th Century Logic and Theology’, Vestigia, imagines, verba: Semiotics and Logic in Medieval Theologicals Texts (XIIth-XIVth Century), (Semiotic and Cognitive Studies IV), ed. Constantino Marmo, Brepols, 1997.
Iwakuma 1999a:
‘Pierre Abélard et Guillaume de Champeaux dans les premières années du XIIe sciècle: une étude préliminaire’, Langage, sciences, philosophie au XIIe siècle (éd. Joel Biard), Paris: Vrin, 1999, pp. 93-123.
Iwakuma 1999b:
‘The Division of Philosophy and the Place of the Trivium From the 9th to the mid-12th Centuries’, Medieval Analyses in Language and Cognition, ed. Sten Ebbesen & Russell L. Fredman, (Historisk-filosofiske Meddelelser 77, Det Kongelige Danske Videnskabernes Selskab) Copenhagen, 1999, pp. 165-189.
Iwakuma 2003a:
'William of Champeaux on Aristotle's Categories', La tradition médévale des Catégories (XIIe-XVe siècles), ed. Joël Biard & Irène Rosier-Catach, Louvain-Paris-Dudley: Peeters, 2003.
Iwakuma 2003b:
'William of Champeaux and the Introductiones', Aristotle's Peri Hermeneias in the Latin Middle Ages: Essays on the Commentary Tradition, ed. H.A.G. Braakhuis & C.H. Kneepkens, Gorningen-Haren: Ingenium, 2003.
Iwakuma 2004a:
'Are Argumentations Propositions?', Medieval Theories on Assertive and Non-Assertive Language, ed. Alfonso Maierù & Luisa Valente, Firenze: Olschki, 2004, pp. 81-110.
Iwakuma 2004b:
'Influence', Cambridge Companion to Abelard (ed. Jeffrey E. Brower & Kevin Guilfoy), Cambridge 2004, pp. 305-335.
Iwakuma 2008:
"Pseudo-Rabanus super Porphyrium (P3), Archives d'histoire doctrinale et littéraire du moyen-âge 75 (2008), pp. 43-196.
Iwakuma 2009:
“Vocales Revisited”, The Word in Medieval Logic, Theology, and Psychology, ed. T. Shimizu and Ch. Burnett, Turnholt: Brepols, pp. 81-171.