Não informado. (2021). Annual Report of the Geological Survey and Mines Department, Bechuanaland. Geological Survey and Mines Department.
Citação do estilo Chicago (17ª ed.)Não informado. Annual Report of the Geological Survey and Mines Department, Bechuanaland. Gaberones: Geological Survey and Mines Department, 2021.
Citação MLA (8ª ed.)Não informado. Annual Report of the Geological Survey and Mines Department, Bechuanaland. Geological Survey and Mines Department, 2021.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.