Bright, J. R., & Schoeman, M. E. F. (1973). A Guide to practical technological forecasting: Editors: J.R.Bright and M.E.F.Schoeman. Prentice-Hall.

Bright, James Rieser, and Milton E F. Schoeman. A Guide to Practical Technological Forecasting: Editors: J.R.Bright and M.E.F.Schoeman. Englewood Cliffs, N.J.: Prentice-Hall, 1973.

Bright, James Rieser, and Milton E F. Schoeman. A Guide to Practical Technological Forecasting: Editors: J.R.Bright and M.E.F.Schoeman. Prentice-Hall, 1973.