Lewis, H. D. (1969). The elusive mind: Based on the first series of the Gifford lectures delivered in the University of Edinburgh, 1966-68. Allen & Unwin.
Chicago-referens (17:e uppl.)Lewis, Hywel David. The Elusive Mind: Based on the First Series of the Gifford Lectures Delivered in the University of Edinburgh, 1966-68. London: Allen & Unwin, 1969.
MLA-referens (9:e uppl.)Lewis, Hywel David. The Elusive Mind: Based on the First Series of the Gifford Lectures Delivered in the University of Edinburgh, 1966-68. Allen & Unwin, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.