1. A. W. Laffan, “The software Maintenance Problem”, Proc. of the Eleventh Hawaii International Conference on System Sciences, pp. 37–39.
2. Software Engineering;Boehm;IEEE TSC-23,1976
3. Managing Software Development in Microprocessor Projects;Magers;IEEE Computer 11,1978
4. PSL/PSA: A Computer-Aided Technique for Structured Documentation and Analysis of Information Processing Systems;Teichrow;IEEE SE-3,1977
5. Structured Analysis for Requirements Definition;Ross;IEEE SE-3,1977