1. Ackermann, F., Eden, C., Williams, T., & Howick, S. (2007). Systemic risk assessment: A case study. The Journal of the Operational Research Society., 58(1), 39–51.
2. ABC News. (2018). Flake calls Trump-Putin summit an ‘Orwellian moment’ [Video]. Accessed Aug 8, 2018, from https://www.facebook.com/ABCNews/videos/10157477658978812/?video_source=permalink
3. Åkerstrøm Anderson, N. (2001). The Undecidability of decision (Copenhagen Business School Working Paper No. 12/2001). Accessed Feb 24, 2016, from https://research-api.cbs.dk/ws/portalfiles/portal/58900668/wp122001.pdf
4. Ashby, R. (1956). An introduction to cybernetics. Chapman & Hall.
5. Baecker, D. (1994). Soziale Hilfe als Funktionssystem der Gesellschaft. Zeitschrift für Soziologie, 23(2), 93–110.