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Johnson, K. (2004). "The Ibis: Transformations in a Twentieth Century British Natural History Journal". Journal of the History of Biology. 37 (3): 515–555. doi:10.1007/s10739-004-1499-3. S2CID83849594.
Steinheimer, F. D. (2004). "Charles Darwin's bird collection and ornithological knowledge during the voyage of H.M.S. Beagle, 1831–1836". Journal of Ornithology. 145 (4): 300–320. doi:10.1007/s10336-004-0043-8. S2CID24957761.