Cita APA (7a ed.)

Haffner, P. (2001). The mystery of reason. Gracewing.

Cita Chicago Style (17a ed.)

Haffner, Paul. The Mystery of Reason. Leominster: Gracewing, 2001.

Cita MLA (9a ed.)

Haffner, Paul. The Mystery of Reason. Gracewing, 2001.