SLACK WV, Porter D, Balkin P, Kowaloff HB, Slack CW.  1990.  Computer-assisted soliloquy as an approach to psychotherapy.. MD Comput. 7(1):37-42,58.

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.

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.