APA
Pieper J., . (1975). The four Cardinal virtues : prudence, justice, fortitude, temperance. Notre Dame: University Press.
Chicago
Pieper Josef, . 1975. The four Cardinal virtues : prudence, justice, fortitude, temperance. Notre Dame: University Press.
Harvard
Pieper J., . (1975). The four Cardinal virtues : prudence, justice, fortitude, temperance. Notre Dame: University Press.
MLA
Pieper Josef, . The four Cardinal virtues : prudence, justice, fortitude, temperance. Notre Dame: University Press. 1975.
