1. Dolerites associated with the Karroo system, South Africa;Daly;Geol. Mag.,1930
2. An exploration program for nickel and copper in the differentiated intrusives of East Griqualand and Pondoland;Dowsett;Geol. Soc. S. Africa Tr.,1967
3. Du Toit, A. L., 1910, Geological survey of the copper-nickel deposits of the Insizwa, Mount Ayliff, East Griqualand: Geol. Comm. Cape of Good Hope, 15th Ann. Rept. p. 111–142
4. The economic geology of the Insizwa Range;Goodchild;Inst. Min. and Met., Tr.,1916
5. Groeneveld, D., 1960, The geological environment of the copper deposits of the Union of South Africa: Comm. Tech. Co-op. Africa South the Sahara, Pub. no. 44, p. 223–230