APA (7th ed.) Citation

(1989). Blackboard systems (Repr.). Addison-Wesley.

Chicago Style (17th ed.) Citation

Blackboard Systems. Repr. Wokingham u.a: Addison-Wesley, 1989.

MLA (9th ed.) Citation

Blackboard Systems. Repr. Addison-Wesley, 1989.

Warning: These citations may not always be 100% accurate.