As cited in: Debora Hammond (2005). "Philosophical and Ethical Foundations of Systems Thinking", in: tripleC 3(2): pp. 20–27.
1950s, Problems of Life (1952, 1960)
“In sharp contrast (with the traditional social planning) the systems design approach seeks to understand a problem situation as a system of interconnected, interdependent, and interacting issues and to create a design as a system of interconnected, interdependent, interacting, and internally consistent solution ideas.”
Source: Designing Social Systems in a Changing World (1996), p. 46; as cited in: Charles François (2004), International Encyclopedia of Systems and Cybernetics. p. 164
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Béla H. Bánáthy 15
Hungarian linguist and systems scientist 1919–2003Related quotes

Source: The Web of Life (1996), p. 3; As cited in: Michael C. Jackson (2000) Systems Approaches to Management. p. 5.

Source: Systems Design of Education (1991), p. 20
Source: 1940s - 1950s, Introduction to Operations Research (1957), p. 7; cited in Werner Ulrich (2004, p. 210)

A Wayne. Wymore (2004) " The nature of research in systems engineering http://sse.stevens.edu/fileadmin/cser/2004/papers/211-Paper119.pdf"; As cited in: Eric David Smith (2006) Tradeoff Studies and Cognitive Biases. p. 31.

Abstract.
Object-oriented design (1991)

Cited in Donella Meadows (2008) Thinking in Systems: a Primer. p. 1.
1970s, The future of operational research is past, 1979

On the financial crisis of 2007–08, as quoted in "Full text of Manmohan Singh's speech at UN General Assembly" http://www.hindustantimes.com/world-news/full-text-of-manmohan-singh-s-speech-at-un-general-assembly/article1-340789.aspx, Hindustan Times (27 September 2008)
2006-2010

We are of course talking here about a man-made system.
The New Economics for Industry, Government, Education (1993)

Source: Systems Design of Education (1991), p. 31 as cited in: K.C Laszlo (1998) Dimensions of Systems Thinking http://archive.syntonyquest.org/elcTree/resourcesPDFs/Systems_Thinking.pdf. Working paper on syntonyquest.org