Kaw Valley Films & Marshall Publishing and Promotions. (2009). The history of the Oregon Trail and the Pony Express. Marshall Pub. and Promotions.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKaw Valley Films और Marshall Publishing and Promotions. The History of the Oregon Trail and the Pony Express. [United States]: Marshall Pub. and Promotions, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKaw Valley Films और Marshall Publishing and Promotions. The History of the Oregon Trail and the Pony Express. Marshall Pub. and Promotions, 2009.
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