Não informado. (2002). Canadian pit and quarry. National Business Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Canadian Pit and Quarry. Gardenvale, Canada: National Business Publications, 2002.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Canadian Pit and Quarry. National Business Publications, 2002.
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