Wilke, P. P. (1962). The petrography of the Steenkampsberg dolerite sill, District Fraserburg. [University of Stellenbosch].
Lua i Stíl Chicago (17ú heag.)Wilke, P. P. The Petrography of the Steenkampsberg Dolerite Sill, District Fraserburg. Stellenbosch: [University of Stellenbosch], 1962.
Lua MLA (8ú heag.)Wilke, P. P. The Petrography of the Steenkampsberg Dolerite Sill, District Fraserburg. [University of Stellenbosch], 1962.
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