The Complete Work of Charles Darwin Online: The Zoology of the Voyage of H.M.S. Beagle – bibliography by Freeman, R. B. (1977) and links to online texts and images of each of the nineteen numbers.
doi.org
dx.doi.org
Bell, Thomas (1834). ”XII. Observations on the Neck of the Three-toed Sloth, Bradypus tridactylus, Linn.”. The Transactions of the Zoological Society of London 1 (2): sid. 113–116. doi:10.1111/j.1096-3642.1835.tb00608.x.
”Thomas Bell (image of memorial stone)”. Find a Grave. https://www.findagrave.com/memorial/42344784. Läst 16 januari 2019. ”In memory of Thomas Bell F.R.S. Professor of Zoology in King's College London. For some time Secretary and Vice-President of the Royal Society and President of the Linnean Society:- of "The Wakes" in this Parish, who died March 13th 1880, aged 87 years. And of Jane Sarah, his Wife, Daughter and sole heir of William Roberts, Esq., of Ruabon, Denbighshire, who died June 29th 1873, aged 75 years. Also of Susan Gosse, their only Child, who died Jan. 4th 1854, aged 17 years.”
