Ibn Labban, Kushyar. Principles of Hindu Reckoning. Translation, introduction and notes by Martin Levey and Marvin Petruck of the KITAB FI USUL HISAB AL-HIND. Madison, WI: University of Wisconsin Press, 1965.
Ibsen, Henrik. Four Plays. New York: Holt, Rinehart and Winston, 1970.
Idziak, Janine Marie. Divine Command Morality: Historical and Contemporary Readings. Madison: University of Wisconsin Press, 1965.
Ihde, Don. Sense and Significance. Pittsburgh: Duquesne University Press, 1973.
Illanes, José Luis. On the Theology of Work. Dublin and Chicago: Scepter Books, 1967.
Incardona, Nunzio. Hosaytos Controfilosofia. Palermo: Manfredi, 1977.
Inciarte, Fernando. Eindeutigkeit und Variation. Fribourg: Verlag Karl Alber, 1973.
Inciarte, Fernando. Forma Formarum: Strukturmomente der Thomistischen Seinslehre im Ruckgriff auf Aristoteles. Fribourg: Verlag Karl Alber, 1970.
Inciarte, Fernando. El Reto del Positivismo Lógico. Madrid: Edicaciones Rialp, 1974.
Inciarte, Fernando. Transzendentale Einbildungskraft. Bonn: H. Bouvier, 1970.
Innocent III, Pope. On the Misery of the Human Condtion (De Miseria Humane Conditionis). Edited by Donald R. Howard; translated by Mararet Mary Dietz. Indianapolis: Bobbs-Merrill, 1969.
Irving, Washington. The Works of Washington Irving. New YOrk: G.P. Putnam, 1860-1863.
Isidorus (Isidori Hispalensis). De Natura Rerum. Amsterdam: Adolf M. Hakkert, 1967.
Iswolsky, Hélène. L'Homme 1936 en Russie Soviétique. Paris: Desclée de Brouwer, 1936.
Ivy, A. C., John F. Pick, and W. F. P. Phillips. Observations on Krebiozen in the Management of Cancer. Chicago: Henry Regnery Co., 1956.