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- Tidmarsh , C.E.M. and Havenga , C.M. 1954 . The wheelpoint method of survey and measurement of semi‐open grasslands and Karoo vegetation in South Africa , Mem. Bot. Surv. S. Afr. No. 29 Pretoria : Govt. Printer .
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- Van der Westhuizen , F.G.J. 1976 . “ n Studie van die produksie en benutting van grasveld met skape in die Sentrale Oranje Vrystaat ” . Dept. Weidingsleer. U.O.V.S. . M.Sc. (Agric)‐Verhandeling.