Cita APA (7a ed.)

St. Clair, O. (2003). A key to Ricardo. Routledge.

Cita Chicago Style (17a ed.)

St. Clair, Oswald. A Key to Ricardo. London: Routledge, 2003.

Cita MLA (9a ed.)

St. Clair, Oswald. A Key to Ricardo. Routledge, 2003.