APA (7th ed.) Citation

Hegner, S. J., McKevitt, P., Norvig, P., & Wilensky, R. Intelligent Help Systems for UNIX. The MIT Press.

Chicago Style (17th ed.) Citation

Hegner, Stephen J., Paul McKevitt, Peter Norvig, and Robert Wilensky. Intelligent Help Systems for UNIX. The MIT Press.

MLA (9th ed.) Citation

Hegner, Stephen J., et al. Intelligent Help Systems for UNIX. The MIT Press.