Man's Place in Nature (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Man's Place in Nature" in Simple English language version.

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darwin-online.org.uk

Darwin C. & Wallace W.R. 1858. On the tendency of species to form varieties; and on the perpetuation of varieties and species by natural means of selection. Journal of the Proceedings of the Linnean Society of London. Zoology 3: 46-50. <http://darwin-online.org.uk/content/frameset?itemID=F350&viewtype=text&pageseq=1>.
Darwin, Charles 1859. On the origin of species by means of natural selection. Murray, London. p488. [1]