1. The Hitchhiker’s Guide to the Galaxy;Adams,1979
2. Albrecht, A.J., 1979. Measuring application development productivity. Proceedings of the Joint SHARE/GUIDE and IBM Application Development Symposium, Chicago. pp. 83–92.
3. Software function, Source lines of code, and development effort prediction: a software science validation;Albrecht;IEEE Trans. Softw. Eng.,1983
4. Requirements-Driven Software Design;Alford,1991
5. Ambler, S.W., 2000. Web services programming tips and tricks: modeling essential use cases. Available at: .