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Mitchell, G.; Skinner, J. D. (2003). »On the origin, evolution and phylogeny of giraffes Giraffa camelopardalis«. Transactions of the Royal Society of South Africa. 58 (1): 51–73. doi:10.1080/00359190309519935. S2CID6522531.
Ramstein, Gilles; Fluteau, Frédéric; Besse, Jean; Joussaume, Sylvie (24. april 1997). »Effect of orogeny, plate motion and land–sea distribution on Eurasian climate change over the past 30 million years«. Nature (v angleščini). 386 (6627): 788–795. Bibcode:1997Natur.386..788R. doi:10.1038/386788a0. S2CID4335003.
Mitchell, G.; van Sittert, S.; Skinner, J. D. (2010). »The demography of giraffe deaths in a drought«. Transactions of the Royal Society of South Africa. 65 (3): 165–68. doi:10.1080/0035919X.2010.509153. hdl:2263/18957. S2CID83652889.