Bill, W. E., & MacGregor, J. (1992). The Columbus Quincentennial, a sourcebook. Washington Center for Improving the Quality of Undergraduate Education, The Evergreen State College.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBill, Willard E., और Jean MacGregor. The Columbus Quincentennial, a Sourcebook. Olympia, Wash.: Washington Center for Improving the Quality of Undergraduate Education, The Evergreen State College, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBill, Willard E., और Jean MacGregor. The Columbus Quincentennial, a Sourcebook. Washington Center for Improving the Quality of Undergraduate Education, The Evergreen State College, 1992.
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