Wilde, Carolyn. Certainty : a discussion of Wittgenstein's notes 'On certainty' / prepared by Carolyn Wilde for the course team. - Milton Keynes : Open University Press, 1977. - 95 p. ; First ed. originally published: 1976. ISBN: 0335052134 Subjects--Topical Terms: Certainty. Dewey Class. No.: 121.63 / Ce