SLACK WV, Leviton A, Bennett SE, Fleischmann KH, Lawrence RS.  1988.  Relation between age, education, and time to respond to questions in a computer-based medical interview.. Comput Biomed Res. 21(1):78-84.

Slack W.  1971.  Computer-based interviewing system dealing with nonverbal behavior as well as keyboard responses.. Science. 171(3966):84-7.