Johnson, Arthur T. “User Friendliness in Microcomputer Programs”. Computer Programs in Biomedicine, vol. 19, no. 2-3, 1985, pp. 127-30, https://doi.org/10.1016/0010-468x(85)90003-0.
Johnson, A. T. (1985). User friendliness in microcomputer programs. Computer Programs in Biomedicine, 19(2-3), 127-130. https://doi.org/10.1016/0010-468x(85)90003-0
Johnson AT. User friendliness in microcomputer programs. Computer Programs in Biomedicine. 1985;19(2-3):127-30.