1. D.J. Andrews (ed.). Information technology — Programming languages, their environments and system software interfaces — Vienna Development Method — Specification Language — Part 1: Base Language. ISO/IEC 13817-1, December 1996.
2. ANSI/MIL-STD 1815A. Reference manual for the Ada programming language, 1983.
3. J. Barnes. High Integrity Ada: The SPARK Approach. Addison-Wesley, 1997.
4. B. Beizer, Software Testing Techniques. Thomson Computer Press, 2nd edition, 1990.
5. W. Burkhardt. Generating programs from syntax. Computing, 2(1):83–94, 1967.