Constitutional law and politics
MLA
O'Brien, David M. Constitutional Law and Politics. Eighth edition. New York: W.W. Norton, 2011
APA, 7th edition
O'Brien, D. M. (2011). Constitutional law and politics. Eighth edition. New York: W.W. Norton
Chicago, 17th edition
O'Brien, David M. Constitutional law and politics. Eighth edition. 2 vols. New York: W.W. Norton, 2011