Cita APA (7a ed.)

Butchvarov, P. (1998). Skepticism about the external world. Oxford University Press.

Cita Chicago Style (17a ed.)

Butchvarov, Panayot. Skepticism About the External World. New York: Oxford University Press, 1998.

Cita MLA (8a ed.)

Butchvarov, Panayot. Skepticism About the External World. Oxford University Press, 1998.