Lecht, C. P. (1977). The waves of change: A techno-economic analysis of the data processing industry. Advance Computer Techniques Corp..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLecht, Charles P. The Waves of Change: A Techno-economic Analysis of the Data Processing Industry. New York: Advance Computer Techniques Corp., 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLecht, Charles P. The Waves of Change: A Techno-economic Analysis of the Data Processing Industry. Advance Computer Techniques Corp., 1977.
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