Markham, J. H. (1977). Seventy years in the Northwest forests. Loggers World Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMarkham, John H. Seventy Years in the Northwest Forests. Chehalis, Wash.: Loggers World Publications, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMarkham, John H. Seventy Years in the Northwest Forests. Loggers World Publications, 1977.
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