[R. L. Ackoff](https://en.wikipedia.org/wiki/Russell_L._Ackoff), 'Systems, organizations, and interdisciplinary research', _General Systems Yearbook_, vol. 5 (1960), Society for General Systems Research, pp. 1-8. [[General Systems Yearbook 1960, for ISSS members](https://www.isss.org/yearbooks/)] ---