Johnson, M. (1996). In search of steam donkeys: Logging equipment in Oregon. TimberTimes.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Merv. In Search of Steam Donkeys: Logging Equipment in Oregon. Hillsboro, OR: TimberTimes, 1996.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohnson, Merv. In Search of Steam Donkeys: Logging Equipment in Oregon. TimberTimes, 1996.
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