APA (7th ed.) Citation

Petrie, C. (1952). Monarchy in the twentieth century. A. Dakers.

Chicago Style (17th ed.) Citation

Petrie, Charles. Monarchy in the Twentieth Century. London: A. Dakers, 1952.

MLA (8th ed.) Citation

Petrie, Charles. Monarchy in the Twentieth Century. A. Dakers, 1952.