APA (7th ed.) Citation

Luff, P., Gilbert, G. N., & Frohlich, D. (1990). Computers and conversation. Academic Press.

Chicago Style (17th ed.) Citation

Luff, Paul, G. Nigel Gilbert, and David Frohlich. Computers and Conversation. London [etc.]: Academic Press, 1990.

MLA (9th ed.) Citation

Luff, Paul, et al. Computers and Conversation. Academic Press, 1990.