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Barnett, R (2006). «Education or degeneration: E. Ray Lankester, H. G. Wells and the outline of history». Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. 37 (2): 203–29. PMID16769556. doi:10.1016/j.shpsc.2006.03.002
Barnett, R (2006). «Education or degeneration: E. Ray Lankester, H. G. Wells and the outline of history». Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. 37 (2): 203–29. PMID16769556. doi:10.1016/j.shpsc.2006.03.002