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Powell Cotton, P.H.G. 1907. An honeymoon among the pygmies: Major and Mrs. Powell Cotton's African Adventures. Graphic (London) 1907 March 9 (Supplement): 1-4.
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Drukker, M. 2018. iPSC generation, prime to naive reversion & characterization and primordial germ cell differentiation of northern white rhino horn. Report to University of Bremen: pp. 1-25.
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Anonymous 2018. World's last male northern white rhino dies. Newsletter of the East African Wildlife Society April 2018: 1-2.
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