Não informado. (1974). Quarry management and products. Quarry Managers Journal.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Quarry Management and Products. London: Quarry Managers Journal, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Quarry Management and Products. Quarry Managers Journal, 1974.
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