1. Allso H.L. and J.C. Roddick 1984 . Rb-Sr and 40Ar-39Ar age determinations on phlogopite micas from the preLebombo Group Dokolwayo kimberlite pipe. Spec. Publ. Geol. Soc. S. Afr. 13, 267–271.
2. Allsop, H.L., W.I. Manton, J.W. Bristow and A.J. Erlank (1984a). Rb-Sr geochronology of Karoo felsic volcanics. Spec. Publ. Geol. Soc. S. Afr. 13, 273–280.
3. Allsop, H.L., J.W. Bristow, C.T. Logan, H.V. Eales and A.J. Erlank (1984b). Karoo-related intrusive complexes. Spec. Publ. Geol. Soc. S. Afr. 13, 273–280.
4. Armstrong, R.A., J.W. Brisstow and K.G. Cox (1984). The Rooi Rand dyke swarm, southern Lebombo. Spec. Publ. Geol. Soc. S. Afr. 13, 77–86.
5. Basaltic Vulcanism Study Project (1981). Basaltic vulcanism on the terrestrial planets. Pergamon Press, New York. 1286 p.