APA (7th ed.) Citation

Booch, G., Rumbaugh, J., & Jacobson, I. (1999). The Unified modeling language user guide. Addison-Wesley.

Chicago Style (17th ed.) Citation

Booch, Grady, James Rumbaugh, and Ivar Jacobson. The Unified Modeling Language User Guide. Reading, Mass.: Addison-Wesley, 1999.

MLA (9th ed.) Citation

Booch, Grady, et al. The Unified Modeling Language User Guide. Addison-Wesley, 1999.