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"Political Progress", The Political Philosophy of Confucianism, Routledge, pp. 258–273, 5 November 2013, doi:10.4324/9781315018775-19 (inactive 23 January 2024), ISBN978-1-315-01877-5{{citation}}: CS1 maint: DOI inactive as of சனவரி 2024 (link)
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oxforddnb.com
Rathbone, Richard (23 September 2004). "Nkrumah, Kwame (1909?–1972), president of Ghana". Oxford Dictionary of National Biography (online). Oxford University Press. DOI:10.1093/ref:odnb/31504.(Subscription or UK public library membership required.)