Porter D, Leviton A, SLACK WV, Graham JR.  1981.  A headache chronicle: the daily recording of headaches and their correlates.. J Chronic Dis. 34(9-10):481-6.

Leviton A, Schulman J, Kammerman L, Porter D, Slack W, Graham JR.  1980.  A probability model of headache recurrence.. J Chronic Dis. 33(7):407-12.

Fisher LA, Johnson TS, Porter D, Bleich HL, SLACK WV.  1977.  Collection of a clean voided urine specimen: a comparison among spoken, written, and computer-based instructions.. Am J Public Health. 67(7):640-4.

Witschi J, Porter D, Vogel S, Buxbaum R, Stare FJ, Slack W.  1976.  A computer-based dietary counseling system.. J Am Diet Assoc. 69(4):385-90.

Slack W, Porter D, Witschi J, Sullivan M, Buxbaum R, Stare FJ.  1976.  Dietary interviewing by computer. An experimental approach to counseling.. J Am Diet Assoc. 69(5):514-7.