P.J. Lytle: Introduction. (PDF) In: Current Status of the HAL/S Compiler on the Modcomp Classic 7870 Computer. National Aeronautics and Space Administration, abgerufen am 27. Februar 2014: „Approximately 85% of the Shuttle Software is coded in HAL/S: a body of 2 million lines of comments, data declarations and executable lines of code.“
