APA (7th ed.) Citation

Murphy, P. L. (1986). The Constitution in the twentieth century. American Historical Assoc.

Chicago Style (17th ed.) Citation

Murphy, Paul L. The Constitution in the Twentieth Century. Washington, DC: American Historical Assoc, 1986.

MLA (9th ed.) Citation

Murphy, Paul L. The Constitution in the Twentieth Century. American Historical Assoc, 1986.