Kok, A., and O. Kok. 2002. “Avifauna in Grassland Communities at Some Inland Airports in South Africa.”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt; 21 (4), 140-48. https://doi.org/10.4102/satnt.v21i4.239.