Verwysings
- Booysen , P. de V. 1969 . An analysis of the fundamentals of grazing management systems . Proc. Grassld Soc. sth. Afr. , 4 : 84 – 91 .
- Booysen , P. de V. 1970 . Populations and pastures in prospective. . Proc. Grassld Soc: sth. Afr. , 5 : 14 – 16 .
- Heady , H.F. Management of grazing animals based upon consequences of grazing . Proc. 2nd United States/Australia Range/and Panel. Adelaide. pp. 299 – 309 .
- Preller , J.H. 1969 . Weidingnavorsing in Suid‐Afrika: ‘n Geskiedkundige oorsig . Hand. Weidingsveren. s. Afr. , 4 : 16 – 18 .