Cita APA (7a ed.)

Hannan, B. (2009). The riddle of the world: A reconsideration of Schopenhauer's philosophy. Oxford University Press.

Cita Chicago Style (17a ed.)

Hannan, Barbara. The Riddle of the World: A Reconsideration of Schopenhauer's Philosophy. Oxford ; New York: Oxford University Press, 2009.

Cita MLA (9a ed.)

Hannan, Barbara. The Riddle of the World: A Reconsideration of Schopenhauer's Philosophy. Oxford University Press, 2009.