^"Dr. Ernest Duncan, 74, Mathematics Professor", نيويورك تايمز, November 28, 1990. Accessed March 21, 2011. "Dr. Ernest R. Duncan, professor emeritus of mathematics at Rutgers University and the author of several mathematics textbooks, died on Sunday at Morristown Memorial Hospital in New Jersey. He was 74 years old and lived in Bernardsville, N.J. He died of leukemia, his family said." "نسخة مؤرشفة". مؤرشف من الأصل في 2009-02-20. اطلع عليه بتاريخ 2019-09-05.{{استشهاد ويب}}: صيانة الاستشهاد: BOT: original URL status unknown (link)
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