Dealing with Complexity
Flood, R.L., & Carson, E.R. 1993. Dealing with Complexity: An introduction to the theory and application of systems science, 2nd ed. New York, NY, USA: Plenum Press.
This source is considered a primary reference for the following articles:
This book includes a definitive explaination of the ideas of system context, and relates it to aspects of the system approach. It also makes the link between complexity and systems thinking, covering both hard and soft views of complexity.