Herschel, W. Philosophical Transactions of the Royal Society of London, 80, 01-01-1790, pàg. 1–20. DOI: 10.1098/rstl.1790.0004 [Consulta: 27 abril 2014].
Herschel, W. Philosophical Transactions of the Royal Society of London, 85, 1795, pàg. 347–409. Bibcode: 1795RSPT...85..347H. DOI: 10.1098/rstl.1795.0021. (reported by Arago, M. «Herschel». Annual Report of the Board of Regents of the Smithsonian Institution p. 198–223, 1871. Arxivat de l'original el 13 gener 2016.)
Herschel, W. Philosophical Transactions of the Royal Society of London, 85, 1795, pàg. 347–409. Bibcode: 1795RSPT...85..347H. DOI: 10.1098/rstl.1795.0021. (reported by Arago, M. «Herschel». Annual Report of the Board of Regents of the Smithsonian Institution p. 198–223, 1871. Arxivat de l'original el 13 gener 2016.)
Herschel, W. Philosophical Transactions of the Royal Society of London, 85, 1795, pàg. 347–409. Bibcode: 1795RSPT...85..347H. DOI: 10.1098/rstl.1795.0021. (reported by Arago, M. «Herschel». Annual Report of the Board of Regents of the Smithsonian Institution p. 198–223, 1871. Arxivat de l'original el 13 gener 2016.)
Herschel, W. Philosophical Transactions of the Royal Society of London, 85, 1795, pàg. 347–409. Bibcode: 1795RSPT...85..347H. DOI: 10.1098/rstl.1795.0021. (reported by Arago, M. «Herschel». Annual Report of the Board of Regents of the Smithsonian Institution p. 198–223, 1871. Arxivat de l'original el 13 gener 2016.)
Afirmat a: A Short History of Astronomy. Autor: Arthur Berry. Editorial: John Murray. Llengua del terme, de l'obra o del nom: anglès britànic. Data de publicació: 1898.