APA (7th ed.) Citation

Keys, P. (1991). Operational research and systems: The systemic nature of operational research. Plenum Press.

Chicago Style (17th ed.) Citation

Keys, Paul. Operational Research and Systems: The Systemic Nature of Operational Research. New York: Plenum Press, 1991.

MLA (9th ed.) Citation

Keys, Paul. Operational Research and Systems: The Systemic Nature of Operational Research. Plenum Press, 1991.

Warning: These citations may not always be 100% accurate.