Kok, A., & Kok, O. (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), 140-148. https://doi.org/10.4102/satnt.v21i4.239