Cita APA (7a ed.)

Sleeman, D., & Brown, J. (1988). Intelligent tutoring systems. Academic Press.

Cita Chicago Style (17a ed.)

Sleeman, D., y J.S Brown. Intelligent Tutoring Systems. London [etc.]: Academic Press, 1988.

Cita MLA (9a ed.)

Sleeman, D., y J.S Brown. Intelligent Tutoring Systems. Academic Press, 1988.