Derby Philosophical Society (English Wikipedia)

Maurice E. Stucke. "Better Competition Advocacy" (PDF). Retrieved 2 July 2011. Herbert Spencer in his Principles of Biology of 1864, vol. 1, p. 444, wrote "This survival of the fittest, which I have here sought to express in mechanical terms, is that which Mr. Darwin has called 'natural selection', or the preservation of favoured races in the struggle for life."

bham.ac.uk

R.P. Sturges. "The membership of Derby Philosophical Society" (PDF). Midland history. Birmingham University. pp. 215–223. Archived from the original (PDF) on 16 March 2009. Retrieved 1 January 2009.

William E. Burns (2003). Science in the Enlightenment. ABC-CLIO. ISBN 1-57607-886-8. Retrieved 2 July 2011.
Daniel Becquemont, Laurent Mucchielli (1998). Le Cas Spencer : Religion, science et politique (in French). Paris: Presses universitaires de France. p. 7. ISBN 978-2-13-049107-1. Retrieved 2 July 2011.
Daniel Becquemont (1985). "Erasmus Darwin, médecin et poète". Revue des sciences humaines (in French) (197–200). Université de Lille, Faculté des lettres: 9. Retrieved 2 July 2011.
Chambers, Neil (17 December 2021). The Indian and Pacific Correspondence of Sir Joseph Banks, 1768–1820, Volume 5. Routledge. p. 216. ISBN 978-1-315-47596-7.
Larkum, Anthony W. D. (6 July 2009). A Natural Calling: Life, Letters and Diaries of Charles Darwin and William Darwin Fox. Springer Science & Business Media. p. 4. ISBN 978-1-4020-9233-6.
Christopher Upham Murray Smith, Robert Arnott (2005). The genius of Erasmus Darwin. Ashgate Publishing, Ltd. p. 188. ISBN 0-7546-3671-2. Retrieved 2 July 2011.

Mick Stanley (December 1976). "13. Derby Museums & Art Gallery" (PDF). Newsletter of the Geological Curators Club. 1 (8): 392–409. Archived from the original (PDF) on 16 July 2011. Retrieved 2 July 2011.

Paul Elliott. "Devonshire Collection – Derby Local Studies Library". Libraries & Culture, Bookplate Archive. University of Texas. Archived from the original on 17 June 2011. Retrieved 2 July 2011.

R.P. Sturges. "The membership of Derby Philosophical Society" (PDF). Midland history. Birmingham University. pp. 215–223. Archived from the original (PDF) on 16 March 2009. Retrieved 1 January 2009.
Paul Elliott. "Devonshire Collection – Derby Local Studies Library". Libraries & Culture, Bookplate Archive. University of Texas. Archived from the original on 17 June 2011. Retrieved 2 July 2011.
"18th century map of Derby". Rev. William Ward. Archived from the original on 6 October 2011. Retrieved 2 July 2011. – Map of Derby showing key points
Mick Stanley (December 1976). "13. Derby Museums & Art Gallery" (PDF). Newsletter of the Geological Curators Club. 1 (8): 392–409. Archived from the original (PDF) on 16 July 2011. Retrieved 2 July 2011.

"18th century map of Derby". Rev. William Ward. Archived from the original on 6 October 2011. Retrieved 2 July 2011. – Map of Derby showing key points