John Frederick William Herschel: razlika između verzija

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* [http://www.webarchive.org.uk/wayback/archive/20100311230213/http://www.midley.co.uk/articles/14march1839.htm R. Derek Wood (2008), 'Fourteenth March 1839, Herschel's Key to Photography']
* [http://www.bath-preservation-trust.org.uk/ Herschelov muzej astronomije]
* [http://assa.saao.ac.za/resource/Chronology4.doc. KronologijaHronologija astronomije u Južnoj Africi]
* [[wikisource:Astronomische Nachrichten/Volume 44/Auszug aus einem Briefe des Herrn J. F. W. Herschel an den Herausgeber|Wikisource copy of a notice from 1823 concerning the star catalogue]], članak u [[Astronomische Nachrichten]]
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