Gaya APA

Kreeft, P. (1990). A Summa Of The Summa ; the essential philosophical passages of St. Thomnas Aquinas' Summa theologica ... (Trawas) . San Francisco: Ignatius Press.

Gaya MLA

Kreeft, Peter. "A Summa Of The Summa ; the essential philosophical passages of St. Thomnas Aquinas' Summa theologica ... (Trawas)". San Francisco: Ignatius Press, 1990. Text.