Cita APA (7th ed.)

Engelmore, R., & Morgan, T. (1988). Blackboard systems. Addison-Wesley.

Cita Chicago (17th ed.)

Engelmore, Robert, i Tony Morgan. Blackboard Systems. Wokingham, England ; Reading, Mass: Addison-Wesley, 1988.

Cita MLA (9th ed.)

Engelmore, Robert, i Tony Morgan. Blackboard Systems. Addison-Wesley, 1988.