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↑ The Canterbury Tales, "The Nun's Priest's Tale" - "Chaucer in the Twenty-First Century", University of Maine at Machias, September 21, 2007
↑ Carol Poster, Richard J. Utz, Disputatio: an international transdisciplinary journal of the late middle ages, Volume 2, pp. 16-17 (1997).
1 2 Boese, Alex (2008) "April Fools Day - Origin " Museum of Hoaxes
↑ Groves, Marsha, Manners and Customs in the Middle Ages, p. 27, 2005.
1 2 "April Fools' Day". Encyclopædia Britannica. สืบค้นเมื่อ April 4, 2013.
↑ Santino, Jack (1972). All around the year: holidays and celebrations in American life. University of Illinois Press. p. 97. ISBN 978-0-252-06516-3.

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