APA (7th ed.) Citation

Ackoff, R. L., & Emery, F. E. (1972). On purposeful systems / (by) Russell L. Ackoff and Fred E. Emery. Tavistock Publications.

Chicago Style (17th ed.) Citation

Ackoff, Russell L., and F. E. Emery. On Purposeful Systems / (by) Russell L. Ackoff and Fred E. Emery. London: Tavistock Publications, 1972.

MLA (9th ed.) Citation

Ackoff, Russell L., and F. E. Emery. On Purposeful Systems / (by) Russell L. Ackoff and Fred E. Emery. Tavistock Publications, 1972.

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