Valacich, J. S., George, J. F., & Hoffer, J. A. (2009). Essentials of systems analysis and design (4th ed.). Prentice Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रValacich, Joseph S., Joey F. George, और Jeffrey A. Hoffer. Essentials of Systems Analysis and Design. 4th ed. Upper Saddle River, N.J: Prentice Hall, 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्रValacich, Joseph S., et al. Essentials of Systems Analysis and Design. 4th ed. Prentice Hall, 2009.
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