1. An Introduction to the Study of Programming Languages;Barron,1977
2. Bingham, J.E., Davies, G.W.A. Handbook of Systems Analysis. London: Macmillan.
3. Formats for presenting procedural instructions;Blaiwes;Journal of Applied Psychology,1974
4. Flowcharting Techniques;Bohl,1971
5. The Mythical Man-Month;Brooks,1975