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. Boston: Addison Wesley, 1999.

MLA (8th ed.) Citation

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