Popejoy, D. (2016). Lewis and Clark and the Oregon Trail: Where the Oregon Trail meets the Columbia River. [Publisher not identified].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPopejoy, Don. Lewis and Clark and the Oregon Trail: Where the Oregon Trail Meets the Columbia River. [Spokane, Wash.]: [Publisher not identified], 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPopejoy, Don. Lewis and Clark and the Oregon Trail: Where the Oregon Trail Meets the Columbia River. [Publisher not identified], 2016.
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