Pask (1976) "Conversational techniques in the study and practice of education", In: British Journal of Educational Psychology, Vol 46, p. 24.
“System' is the concept that refers both to a complex of interdependencies between parts, components, and processes, that involves discernible regularities of relationships, and to a similar type of interdependency between such a complex and its surrounding environment.”
Talcott Parsons (1968) "Systems Analysis: Social Systems" in: David L. Sills ed. International Encyclopedia of the Social Sciences. p. 458; Cited in: Ida R. Hoos (1972) Systems Analysis in Public Policy: A Critique.
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Talcott Parsons 17
American sociologist 1902–1979Related quotes
Cited in: Addison C. Bennett (1978) Improving management performance in health care institutions: a total systems approach.. p. 40
A methodology for systems engineering, 1962
Eric Trist, "A concept of organizational ecology." Australian journal of management 2.2 (1977): 161-175. p. 161; abstract

Michael Halliday (2005, p. 68) as cited in: Andrew Halliday and Marion Glaser (2011) "A Management Perspective on Social Ecological Systems". In: Human Ecology Review, Vol. 18, No. 1, 2011.
1970s and later
Source: Enterprise modeling within an enterprise engineering framework (1996), p. 993
Source: 1960s, Robots, Men and Minds (1967), p. 69

Source: Structure of American economy, 1919-1929, 1941, p. 33, as cited in: Drejer, Ina. " The Role of Technological Linkages in a Leontief Scheme-From Static Structures to Endogenous Evolution of Technical Coefficients http://www.druid.dk/uploads/tx_picturedb/dw1999-340.pdf." Preparado para: DRUID Winter Conference, Holte (enero 1999). 1998.
Jay Lemke. " Ecosocial Dynamics http://academic.brooklyn.cuny.edu/education/jlemke/ecosoc.htm," at academic.brooklyn.cuny.edu, Accessed 03. 2017.
George A. Kelly, "Man's construction of his alternatives." Assessment of human motives (1958): 33-64.
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)