1. J. P. van Gigch, Applied General Systems Theory, 2d. ed. (Harper and Row, London and New York, 1978), ch. 8.
2. J. P. van Gigch, Applied General Systems Theory, Ref. 1, ch. 9.
3. J. P. van Gigch, Hum. Sys. Mgt. 4, 220 (1984).
4. G. Zukav, The Dancing Wu Li Masters: An Overview of the New Physics, (William Morrow, New York, 1979), pp. 129–130.
5. As quoted in G. Zukav, The Dancing Wu Li Masters, Ref. 4, pp. 93, 95.