The Concept of Law (English Wikipedia)

Hart, HLA (1953). "Definition and Theory in Jurisprudence". Essays in Jurisprudence and Philosophy. Oxford: Clarendon Press (published 1983). p. 19. ISBN 9780191018725.
Hart, H. L. A. (1961). The Concept of Law. Oxford University Press (published 2012). p. 13. ISBN 9780199644698.

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Abbott, Kenneth W.; Keohane, Robert O.; Moravcsik, Andrew; Slaughter, Anne-Marie; Snidal, Duncan (2000). "The Concept of Legalization" (PDF). International Organization. 54 (3): 401–419. doi:10.1162/002081800551271. ISSN 1531-5088. S2CID 16285815. Archived from the original on 2005-01-20.

Lacey, Nicola (2006). A Life of H.L.A. Hart. Oxford: Oxford University Press. p. 225. doi:10.1093/acprof:oso/9780199202775.003.0010. ISBN 9780199202775.
Lacey, Nicola (2006). A Life of H.L.A. Hart. Oxford: Oxford University Press. p. 224. doi:10.1093/acprof:oso/9780199202775.003.0010. ISBN 9780199202775.
Lacey, Nicola (2006). A Life of H.L.A. Hart. Oxford: Oxford University Press. p. 222. doi:10.1093/acprof:oso/9780199202775.003.0010. ISBN 9780199202775.
Hart, H. L. A. (1958). "Positivism and the Separation of Law and Morals". Harvard Law Review. 71 (4): 593–629. doi:10.2307/1338225. ISSN 0017-811X. JSTOR 1338225.
Abbott, Kenneth W.; Keohane, Robert O.; Moravcsik, Andrew; Slaughter, Anne-Marie; Snidal, Duncan (2000). "The Concept of Legalization" (PDF). International Organization. 54 (3): 401–419. doi:10.1162/002081800551271. ISSN 1531-5088. S2CID 16285815. Archived from the original on 2005-01-20.

Hart, H. L. A. (1958). "Positivism and the Separation of Law and Morals". Harvard Law Review. 71 (4): 593–629. doi:10.2307/1338225. ISSN 0017-811X. JSTOR 1338225.

Abbott, Kenneth W.; Keohane, Robert O.; Moravcsik, Andrew; Slaughter, Anne-Marie; Snidal, Duncan (2000). "The Concept of Legalization" (PDF). International Organization. 54 (3): 401–419. doi:10.1162/002081800551271. ISSN 1531-5088. S2CID 16285815. Archived from the original on 2005-01-20.

Marshall, Richard (2012-07-06). "The Endless Search For Truth: Richard Marshall interviews Andrei Marmor". 3:AM Magazine. Archived from the original on 8 June 2019. Retrieved 19 September 2013.
Abbott, Kenneth W.; Keohane, Robert O.; Moravcsik, Andrew; Slaughter, Anne-Marie; Snidal, Duncan (2000). "The Concept of Legalization" (PDF). International Organization. 54 (3): 401–419. doi:10.1162/002081800551271. ISSN 1531-5088. S2CID 16285815. Archived from the original on 2005-01-20.

Hart, HLA (1988). "Answers to Eight Questions". In Duarte d'Almeida, Luis; Edwards, James; Dolcetti, Andrea (eds.). Reading HLA Hart's The Concept of Law. Oxford: Hart Publishing (published 2013). ISBN 1782252169. OCLC 884479238.
Hart, H. L. A. (1958). "Positivism and the Separation of Law and Morals". Harvard Law Review. 71 (4): 593–629. doi:10.2307/1338225. ISSN 0017-811X. JSTOR 1338225.
Abbott, Kenneth W.; Keohane, Robert O.; Moravcsik, Andrew; Slaughter, Anne-Marie; Snidal, Duncan (2000). "The Concept of Legalization" (PDF). International Organization. 54 (3): 401–419. doi:10.1162/002081800551271. ISSN 1531-5088. S2CID 16285815. Archived from the original on 2005-01-20.