Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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