APA
Morrall J. B., . (1962). Political thought in medieval times. New York: Harper.
Chicago
Morrall John B, . 1962. Political thought in medieval times. New York: Harper.
Harvard
Morrall J. B., . (1962). Political thought in medieval times. New York: Harper.
MLA
Morrall John B, . Political thought in medieval times. New York: Harper. 1962.