APA (7th ed.) Citation

Boulton, P. I., Soper, R. E., & Lee, E. S. (1990). Simulation of two LANs.

Chicago Style (17th ed.) Citation

Boulton, P. I., R. E. Soper, and E. S. Lee. Simulation of Two LANs. Toronto, 1990.

MLA (9th ed.) Citation

Boulton, P. I., et al. Simulation of Two LANs. 1990.