Federal Writers' Project. (1939). The Oregon Trail: The Missouri river to the Pacific ocean. Hastings House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFederal Writers' Project. The Oregon Trail: The Missouri River to the Pacific Ocean. New York: Hastings House, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFederal Writers' Project. The Oregon Trail: The Missouri River to the Pacific Ocean. Hastings House, 1939.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.