Arendt, Wayne J. (1988). »Range Expansion of the Cattle Egret, (Bubulcus ibis) in the Greater Caribbean Basin«. Colonial Waterbirds. 11 (2): 252–62. doi:10.2307/1521007.
Mitchell, K.J.; Llamas, B.; Soubrier, J.; Rawlence, N.J.; Worthy, T.H.; Wood, J.; Lee, M.S.Y.; Cooper, A. (23. maj 2014). »Ancient DNA reveals elephant birds and kiwi are sister taxa and clarifies ratite bird evolution«. Science. Zv. 344, št. 6186. str. 898–900. Bibcode:2014Sci...344..898M. doi:10.1126/science.1251981. PMID24855267.
harvard.edu
ui.adsabs.harvard.edu
Mitchell, K.J.; Llamas, B.; Soubrier, J.; Rawlence, N.J.; Worthy, T.H.; Wood, J.; Lee, M.S.Y.; Cooper, A. (23. maj 2014). »Ancient DNA reveals elephant birds and kiwi are sister taxa and clarifies ratite bird evolution«. Science. Zv. 344, št. 6186. str. 898–900. Bibcode:2014Sci...344..898M. doi:10.1126/science.1251981. PMID24855267.