Plato's theory of knowledge ; the Theaetetus and the Sophist of Plato, translated with a running commentary by Francis Macdonald Cornford ... Plato. Cornford, Francis Macdonald. Plato. Sophist. English. 184 PLP London : K. Paul, Trench, Trubner, 1969. 1969. 1967 Text xiv, 336 p.; eng International library of psychology, philosophy, and scientific method