Cita APA (7a ed.)

Graham, I., Henderson-Sellers, B., & Younessi, H. (1997). The OPEN process specification. ACM ; Addison-Wesley.

Cita Chicago Style (17a ed.)

Graham, Ian, Brian Henderson-Sellers, y Houman Younessi. The OPEN Process Specification. New York : Harlow [etc.]: ACM ; Addison-Wesley, 1997.

Cita MLA (9a ed.)

Graham, Ian, et al. The OPEN Process Specification. ACM ; Addison-Wesley, 1997.