Whitten, J. L., Bentley, L. D., & Dittman, K. C. (2001). Systems analysis and design methods (5th ed.). Irwin/McGraw-Hill.

Whitten, Jeffrey L., Lonnie D. Bentley, and Kevin C. Dittman. Systems Analysis and Design Methods. 5th ed. Boston, Mass.: Irwin/McGraw-Hill, 2001.

Whitten, Jeffrey L., et al. Systems Analysis and Design Methods. 5th ed. Irwin/McGraw-Hill, 2001.