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G. Harris , S. Thirgood , G. Hopcraft , J.P.G.M. Cromsigt & J. Berger (2009) Global decline in aggregated migrations of large terrestrial mammals. Endangered Species Research, 7, 55–76.
R. Naidoo , M.J. Chase , P. Beytell , P. Du Preez , K. Landen , G. Stuart-Hill & R. Taylor (2016) A newly discovered wildlife migration in Namibia and Botswana is the longest in Africa. Oryx, 50, 138–146.