APA (7th ed.) Citation

Quarterman, J. S. (1990). The matrix: Computer networks and conferencing systems worldwide. Digital Press.

Chicago Style (17th ed.) Citation

Quarterman, John S. The Matrix: Computer Networks and Conferencing Systems Worldwide. Bedford, Mass.: Digital Press, 1990.

MLA (9th ed.) Citation

Quarterman, John S. The Matrix: Computer Networks and Conferencing Systems Worldwide. Digital Press, 1990.