APA
Behrens E., . (1972). Ring theory. New York: Academic Press.
Chicago
Behrens Ernst-Auguest, . 1972. Ring theory. New York: Academic Press.
Harvard
Behrens E., . (1972). Ring theory. New York: Academic Press.
MLA
Behrens Ernst-Auguest, . Ring theory. New York: Academic Press. 1972.
