Porter, J. B., Durley, R. J., Stansfield, E., Denis, T. C., Brunton, S. L., De Hart, J. B., . . . Cameron, A. E. (1912). An investigation of the coals of Canada: With reference to their economic qualities. Government printing bureau.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPorter, John Bonsall, Richard John Durley, Edgar Stansfield, Theophile Constant Denis, Stopford Lauder Brunton, Joseph Bertram De Hart, Edward Eric Billington, और Alan Emerson Cameron. An Investigation of the Coals of Canada: With Reference to Their Economic Qualities. Ottawa: Government printing bureau, 1912.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPorter, John Bonsall, et al. An Investigation of the Coals of Canada: With Reference to Their Economic Qualities. Government printing bureau, 1912.
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