found: Choose once again, 1981 (a.e.)t.p. (William N. Thetford)
found: A course in miracles, 1996:page vii (William Thetford, professor of Medical Psychology at Columbia University's College of Physicians and Surgeons in New York City)
found: Wikipedia, Mar. 2, 2009(William Thetford; William N. Thetford, Ph.D. (Apr. 23, 1923-July 4, 1988) was trained as a psychologist, and remained professionally active in this field throughout his life. Thetford worked in a collaborative venture with Dr. Helen Schucman in writing A Course In Miracles (ACIM), and also with its initial edits)
found: Never forget to laugh, c2009:t.p. (Bill Thetford)