* Josef Pieper, Berthold Wald, "For the Love of Wisdom: Essays on the Nature of Philosophy", Translator: Roger Wasserman, Ignatius Press, 2006 ISBN 1-58617-087-2.
* Josef Pieper, Berthold Wald, "For the Love of Wisdom: Essays on the Nature of Philosophy", Translator: Roger Wasserman, Ignatius Press, 2006 ISBN 1-58617-087-2.