APA Style

Wittgenstein, L., McGinn, M. (1997). Routledge philosophy guidebook to Wittgenstein and the Philosophical investigations . New York :: Routledge,.

MLA Style

Wittgenstein, Ludwig,., McGinn, Marie.. "Routledge philosophy guidebook to Wittgenstein and the Philosophical investigations". New York :: Routledge,, 1997. .