APA (7th ed.) Citation

Firesmith, D., Henderson-Sellers, B., & Graham, I. S. (1998). OPEN modeling language OML: Reference manual. Cambridge University.

Chicago Style (17th ed.) Citation

Firesmith, Donald, Brian Henderson-Sellers, and Ian S. Graham. OPEN Modeling Language OML: Reference Manual. Cambridge: Cambridge University, 1998.

MLA (9th ed.) Citation

Firesmith, Donald, et al. OPEN Modeling Language OML: Reference Manual. Cambridge University, 1998.