Whittington, P. A., Randall, R. M., Crawford, R. J., Wolfaardt, A. C., Klages, N. T., Randall, B. M., Bartlett, P. A., Chesselet, Y. J., & Jones, R. (2005). Patterns of immigration to and emigration from breeding colonies by African penguins. African Journal of Marine Science, 27(1), 205–213. https://doi.org/10.2989/18142320509504079