Cita APA (7a ed.)

Duncan, S. M. (2008). The Proof of the External World: : Cartesian Theism and the Possibility of Knowledge. James Clarke.

Cita Chicago Style (17a ed.)

Duncan, Steven M. The Proof of the External World: : Cartesian Theism and the Possibility of Knowledge. Cambridge: James Clarke, 2008.

Cita MLA (9a ed.)

Duncan, Steven M. The Proof of the External World: : Cartesian Theism and the Possibility of Knowledge. James Clarke, 2008.