↑ Herschel, W. (1795) Description of a Forty-feet Reflecting Telescope, Philosophical Transactions of the Royal Society of London, Vol. 85, pp. 347—409 (reported by M. Arago (1871), Herschel 2016 йылдың 13 ғинуар көнөндә архивланған., Annual Report of the Board of Regents of the Smithsonian Institution, pp. 198—223)