Wright, L. B., & Fowler, E. W. (1972). The moving frontier: North America seen through the eyes of its pioneer discoverers. Delacorte Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWright, Louis B., और Elaine W. Fowler. The Moving Frontier: North America Seen Through the Eyes of Its Pioneer Discoverers. [New York]: Delacorte Press, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWright, Louis B., और Elaine W. Fowler. The Moving Frontier: North America Seen Through the Eyes of Its Pioneer Discoverers. Delacorte Press, 1972.
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