Monk, A., Diaper, D., and Harrison, M. D. (1992). People and Computers VII. 534 pages, US$69.96: Cambridge, England: Cambridge University Press. (ISBN 0–521–44591–4)
Duffy, T. M., Palmer, J. E., and Mehlenbacher, B. (1992). Online Help: Design and Evaluation. 260 pages, US$55.00 (cloth) US$26.50 (paper): Norwood, NJ: Ablex Publishing Corp. (ISBN 0–89391–848–2)