Cita APA (7a ed.)

Williams, M. (1996). Unnatural doubts: Epistemological realism and the basis of scepticism. Princeton University Press.

Cita Chicago Style (17a ed.)

Williams, Michael. Unnatural Doubts: Epistemological Realism and the Basis of Scepticism. Princeton, N.J.: Princeton University Press, 1996.

Cita MLA (9a ed.)

Williams, Michael. Unnatural Doubts: Epistemological Realism and the Basis of Scepticism. Princeton University Press, 1996.