Bill, W. E., & MacGregor, J. (1992). The Columbus Quincentennial, a sourcebook. Washington Center for Improving the Quality of Undergraduate Education, The Evergreen State College.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Bill, Willard E., و Jean MacGregor. The Columbus Quincentennial, a Sourcebook. Olympia, Wash.: Washington Center for Improving the Quality of Undergraduate Education, The Evergreen State College, 1992.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Bill, Willard E., و Jean MacGregor. The Columbus Quincentennial, a Sourcebook. Washington Center for Improving the Quality of Undergraduate Education, The Evergreen State College, 1992.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.