1. von Bertalanffy L. 1968. General system theory. George Braziller, New York.
2. Heylighen F. 2004. Principia Cybernetica Web (http://pespmc1.vub.ac.be) Center Leo Apostel, Vrije Universiteit Brussel, Krijgskundestraat 33, B-1160 Brussels, Belgium.
3. Laszlo E, ed. 1972. The relevance of general systems theory. George Braziller, New York.
4. Koestler A, Smythes JR, eds. 1968. Beyond reductionism. Hutchinson, London.
5. Kresh JY, Armour JA. 1997. The heart as a self-regulating system: integration of homeodynamic mechanisms. Technol Health Care 5(1):159–169.