The perennial philosophy
MLA
Huxley, Aldous. The Perennial Philosophy. London: Chatto and Windus, 1946.
APA
Huxley, A. (1946). The perennial philosophy. London: Chatto and Windus.
Chicago
Huxley, Aldous, The Perennial Philosophy. London: Chatto and Windus, 1946.