1. Ayer, Alfred J. 1954. Philosophical essays. London: Macmillan.
2. Ayer, Alfred J. 1956. The problem of knowledge. London: Penguin Books.
3. Crane, Tim. 2017. Philosophy, science and the value of understanding. In K. Almqvist & I. Thomas (eds.), Sapere aude. The future of the humanities in British Universities, 175–183. Stockholm: Axel and Margaret Ax:son Johnson Foundation.
4. Dyson, Freeman. 2015. Dreams of earth and sky. New York: The New York Review of Books.
5. Einstein, Albert. 1949. Autobiographical notes & Remarks to the essays appearing in this collective volume. In P. A. Schilpp (ed.), Albert Einstein: Philosopher-scientist, 3–95 & 665–688. New York: Tudor. 19512.