1. ”Steelman”, Requirements For High Order Computer Programming Languages, Department of Defense, June 1978
2. Ada Reference Manual, Proposed Standard Document, United States Department of Defense, July 1980 in Ledgard, H., Ada: An Introduction, New York Heidelberg Berlin 1981
3. Reference Manual for the Ada Programming Language, ANSI/MIL-STD-1815A, United States Department of Defense, January 1983
4. Ada Compiler Validation Procedures, Version 2.0 May 1989, Ada Joint Program Office, Washington DC
5. Mangold, K., Die ”Echtzeitsprachen” PEARL und Ada - ein Vergleich, in Drebinger, L. (Hrsgb), Echtzeit 90 S. 187–198