Παραπομπή σε μορφή APA (7η εκδ.)

Kreeft, P. (1993). A Shorter Shumma: The most essential philosophical passages of St. Thomas Aquinas' Summa Theologica. Ignatius Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Kreeft, Peter. A Shorter Shumma: The Most Essential Philosophical Passages of St. Thomas Aquinas' Summa Theologica. San Francisco: Ignatius Press, 1993.

Παραπομπή σε μορφή MLA (8th εκδ.)

Kreeft, Peter. A Shorter Shumma: The Most Essential Philosophical Passages of St. Thomas Aquinas' Summa Theologica. Ignatius Press, 1993.