HOFFER, J. A., GEORGE, J. F., & VALACICH, J. S. (2002). Modern systems analysis and design.-- ed.3. Prentice Hall.

HOFFER, Jeffrey A., Joey F. GEORGE, and Joseph S. VALACICH. Modern Systems Analysis and Design.-- Ed.3. New Jersey: Prentice Hall, 2002.

HOFFER, Jeffrey A., et al. Modern Systems Analysis and Design.-- Ed.3. Prentice Hall, 2002.