His Nutritional epidemiology, 1989: CIP t.p. (Walter Willett, M.D.)

Willett, Walter C. The Harvard Medical School guide to healthy eating, 2001: CIP t.p. (Walter C. Willett, M.D.)

Harvard School of Public Health faculty Web site, Feb. 11, 2003 (Walter Willett; Fredrick John Stare Professor of Epidemiology and Nutrition, Departments of Nutrition and Epidemiology; Dr. P.H., 1980, Harvard School of Public Health, Epidemiology)

Eat, drink, and weigh less, c 2006: CIP t.p. (Walter Willett, M.D.) data sheet (b. June 20, 1945)

Official ABMS directory of board certified medical specialists, 2000: v. 1, p. 2514 (Willett, Walter Churchill, b. 1945, Hart, Mich.; MD, Univ. of Michigan Medical School, 1971)