1. Alexander, C. (1979). The timeless way of building (Vol. 1). New York: Oxford University Press.
2. Alexander, C. (2002a). The nature of order. An essay on the art of building and the nature of the universe: Book I – the phenomenon of life. Berkeley: The Center for Environmental Structure.
3. Alexander, C. (2002b). The nature of order. An essay on the art of building and the nature of the universe: Book II – the process of creating life. Berkeley: The Center for Environmental Structure.
4. Ashby, W. R. (1962). Principles of the self-organizing system. In H. von Foerster & G. W. Zopf (Eds.), Principles of self-organization (pp. 255–278). New York: Pergamon.
5. Ashby, W. R. (2011). Variety, constraint, and the law of requisite variety. Emergence: Complexity and Organization, 13(1/2), 190–270.