APA (7th ed.) Citation

Ackoff, R. L., & Emery, F. E. (1972). On purposeful systems. Tavistock Publications.

Chicago Style (17th ed.) Citation

Ackoff, Russell Lincoln, and F. E. Emery. On Purposeful Systems. London: Tavistock Publications, 1972.

MLA (9th ed.) Citation

Ackoff, Russell Lincoln, and F. E. Emery. On Purposeful Systems. Tavistock Publications, 1972.

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