Valacich, J. S., George, J., & Hoffer, J. A. (2012). Essentials of systems analysis and design (5th ed, international ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Valacich, Joseph S., Joey George, agus Jeffrey A. Hoffer. Essentials of Systems Analysis and Design. 5th ed, international ed. Upper Saddle River, New Jersey: Prentice Hall, 2012.
Lua MLA (9ú heag.)Valacich, Joseph S., et al. Essentials of Systems Analysis and Design. 5th ed, international ed. Prentice Hall, 2012.
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