Issue No.04 - April (1981 vol.14)
B.W. Kernighan , Bell Laboratories
Since complex Unix tools are built from simple, single-function components, programmers see their work as the creation and use of tools. This view encourages growth, not reinvention.
B.W. Kernighan, J.R. Mashey, "The Unix Progamming Environment", Computer, vol.14, no. 4, pp. 12-24, April 1981, doi:10.1109/C-M.1981.220408