Luhmann, Niklas (1982). "The World Society as a Social System". International Journal of General Systems. 8 (3). Informa UK Limited: 131–138. doi:10.1080/03081078208547442. ISSN0308-1079.
Roth, S. (2011) Les deux angleterres et le continent. Anglophone sociology as the guardian of Old European semantics, Journal of Sociocybernetics, Vol. 9, No. 1-2, available for download at SSRN
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Niklas Luhmann: Kommunikation mit Zettelkästen. Ein Erfahrungsbericht, in: André Kieserling (ed.), Universität als Milieu. Kleine Schriften, Haux, Bielefeld 1992, ISBN3-925471-13-8, p. 53–61; translated in: "Communicating with Slip Boxes". luhmann.surge.sh. Retrieved 2020-05-31.
Luhmann, Niklas (1982). "The World Society as a Social System". International Journal of General Systems. 8 (3). Informa UK Limited: 131–138. doi:10.1080/03081078208547442. ISSN0308-1079.
Maturana, Humberto (2004). From being to doing : the origins of the biology of cognition. Heidelberg: Carl Auer Verlag. pp. 105–108. ISBN3-89670-448-6. OCLC59207392.