Botswana. Geological Survey Dept, Green, D., & Baldock, J. W. Coal exploration records of boreholes. Geological Survey Dept., Ministry of Mineral Resources and Water Affairs.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBotswana. Geological Survey Dept, Derek Green, और J. W. Baldock. Coal Exploration Records of Boreholes. [Gaborone] Botswana: Geological Survey Dept., Ministry of Mineral Resources and Water Affairs.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBotswana. Geological Survey Dept, et al. Coal Exploration Records of Boreholes. Geological Survey Dept., Ministry of Mineral Resources and Water Affairs.
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