Marchal, J. H. (1975). "On the Concept of a System". Philosophy of Science. 42 (4). [Cambridge University Press, The University of Chicago Press, Philosophy of Science Association]: 448–468. ISSN0031-8248. JSTOR187223. Retrieved 2024-05-31. as reprinted in Gerald Midgely (ed.) (2002) Systems thinking vol One
Marchal, J. H. (1975). "On the Concept of a System". Philosophy of Science. 42 (4). [Cambridge University Press, The University of Chicago Press, Philosophy of Science Association]: 448–468. ISSN0031-8248. JSTOR187223. Retrieved 2024-05-31. as reprinted in Gerald Midgely (ed.) (2002) Systems thinking vol One