Butler, Hennie, and Ordino Kok. 2007. “Habitat Preference, Feeding Distance and Flight Direction of Cattle Egrets (Bubulcus Ibis) in the Central Free State.”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt; 26 (3), 196-204. https://doi.org/10.4102/satnt.v26i3.133.