APA

Barrett Edward L, Cohen William, . (1981). Constitutional law : Cases and materials. New York: The Foundation Press.

Chicago

Barrett Edward L, Cohen William, . 1981. Constitutional law : Cases and materials. New York: The Foundation Press.

Harvard

Barrett Edward L, Cohen William, . (1981). Constitutional law : Cases and materials. New York: The Foundation Press.

MLA

Barrett Edward L, Cohen William, . Constitutional law : Cases and materials. New York: The Foundation Press. 1981.