Freedman, R. (2007). Who was first?: Discovering the Americas. Clarion Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFreedman, Russell. Who Was First?: Discovering the Americas. New York: Clarion Books, 2007.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFreedman, Russell. Who Was First?: Discovering the Americas. Clarion Books, 2007.
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