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2. (ed.). Techniques of Program and System Maintenance (2nd edn). QED Information Sciences, Inc.: Wellesley MA, 1988; 461 pp. (also published in Portuguese).
3. Handbook of Software Maintenance. John Wiley & Sons, Inc.: New York NY, 1986; 447 pp. (also published in Japanese).
4. Programmer Productivity: Achieving an Urgent Priority. Reston Publishing Co., Inc.: Reston VA, 1984; 235 pp.
5. How to Measure Programmer Productivity. Shetal Enterprises: Chicago IL, 1981; 96 pp. and QED Information Sciences, Inc.: Wellesley MA, 1982; 96 pp.