APA
Ozment S. E., . (1980). The age of reform (1250-1550). New Haven: Yale University Press.
Chicago
Ozment Steven E, . 1980. The age of reform (1250-1550). New Haven: Yale University Press.
Harvard
Ozment S. E., . (1980). The age of reform (1250-1550). New Haven: Yale University Press.
MLA
Ozment Steven E, . The age of reform (1250-1550). New Haven: Yale University Press. 1980.