"Charles Thomas Hudson, M. A, LL". Journal of the Royal Microscopical Society. 24 (1). Wiley-Blackwell: 48–49. 1904. doi:10.1111/j.1365-2818.1904.tb00597.x.
Hartley, H. (1966). "Stanislao Cannizzaro, F.R.S. (1826–1910) and the First International Chemical Conference at Karlsruhe in 1860". Notes and Records of the Royal Society. 21 (1): 56–63. doi:10.1098/rsnr.1966.0006. ISSN0035-9149. S2CID58453894.
Chanda, Sunirmal; Caulton, Eric (1999). "David Douglas Cunningham (1843–1914): a biographical profile". Aerobiologia. 15 (4): 255–258. doi:10.1023/a:1007698905558. S2CID81404819.
Hartley, H. (1966). "Stanislao Cannizzaro, F.R.S. (1826–1910) and the First International Chemical Conference at Karlsruhe in 1860". Notes and Records of the Royal Society. 21 (1): 56–63. doi:10.1098/rsnr.1966.0006. ISSN0035-9149. S2CID58453894.
Hartley, H. (1966). "Stanislao Cannizzaro, F.R.S. (1826–1910) and the First International Chemical Conference at Karlsruhe in 1860". Notes and Records of the Royal Society. 21 (1): 56–63. doi:10.1098/rsnr.1966.0006. ISSN0035-9149. S2CID58453894.