1. The problem of knowledge / [A. J. Ayer] Author: Ayer, A. J. (Alfred Jules), 1910-1989, author Format: Book Language: English Published: 1962
2. Immanuel Kant's critique of pure reason / translated by Norman Kemp Smith Author: Kant, Immanuel, 1724-1804, author Uniform Title: Kritik der reinen Vernunft. English Format: Book Language: English Published: 1977