References
- Acocks , J.P.H. 1953 . Veld types of South Africa , Mem. Bot. Surv. S. Afr. No. 28 Pretoria : Govt Printer .
- Hattingh, I.D., 1966: Unpublished Progress report H‐Ps. 31/2.
- Van Graan , J.F. 1970 . Die chemiese beheer van Pachystigma pygmaeum (Schltr) Robyns , P.U. vir C.H.O. . M.Sc. thesis,