Issue No.03 - March (1977 vol.10)
J. Warren , Dr. Dobb's Journal of Computer Calisthenics and Orthodontia
Within the past two years, a new technical hobby has come into existence: computers. It appears that there may be in excess of 20,000 computers in not-for-profit use in homes and garages today?purchased, presumably, from the family's entertainment budget.
J. Warren, "Personal and Hobby Computing: an Overview", Computer, vol.10, no. 3, pp. 10-22, March 1977, doi:10.1109/C-M.1977.217667