@book{Pieper, author = {Pieper, J.}, title = {Guide to Thomas Aquinas, New York (Mentor-Omega) 1964.}, language = {en} } @article{Pieper, author = {Pieper, J.}, title = {Heroism and Fortitude}, series = {Hutchins, R. M., Adler, M. J. (Eds.): The Great Ideas Today, London (Encyclopaedia Britannica) 1973, pp. 50-56.}, journal = {Hutchins, R. M., Adler, M. J. (Eds.): The Great Ideas Today, London (Encyclopaedia Britannica) 1973, pp. 50-56.}, language = {en} }