Geological Survey (South Africa) & Rogers, A. W. (1925). The geological structure of the Union.: An explanation of the geological map of the Union of South Africa, on the scale of one to a million. The Government printing and stationery office.
Citace podle Chicago (17th ed.)Geological Survey (South Africa) a A. W. Rogers. The Geological Structure of the Union.: An Explanation of the Geological Map of the Union of South Africa, on the Scale of One to a Million. Pretoria: The Government printing and stationery office, 1925.
Citace podle MLA (8th ed.)Geological Survey (South Africa) a A. W. Rogers. The Geological Structure of the Union.: An Explanation of the Geological Map of the Union of South Africa, on the Scale of One to a Million. The Government printing and stationery office, 1925.