Warmer, J., Ivner, A., & Kleppe, A. (2003). The object constraint language: Getting your models ready for MDA (2nd ed.). Addison-Wesley.

Warmer, Jos, Anders Ivner, and Anneke Kleppe. The Object Constraint Language: Getting Your Models Ready for MDA. 2nd ed. Boston, MA: Addison-Wesley, 2003.

Warmer, Jos, et al. The Object Constraint Language: Getting Your Models Ready for MDA. 2nd ed. Addison-Wesley, 2003.