The earliest known version is an unattributed drawing from the 23 October 1892 issue of Fliegende Blätter, a German humour magazine. It was captioned "Welche Thiere gleichen einander am meisten?" ("Which animals are most like each other?"), with "Kaninchen und Ente" ("Rabbit and Duck") written underneath.
- Weisstein, Eric W., "Rabbit–duck illusion", MathWorld.
- McManus, I. C.; Freegard, Matthew; Moore, James; Rawles, Richard (2010). "Science in the Making: Right Hand, Left Hand. II: The duck–rabbit figure". Laterality 15: 167. Retrieved 18 February 2012.
From Library of Congress-1973
A416879 Stanley M. Nelson & Leslie W. Kangas. Rab-Pen-Duck Enterprises© Wise Quacks by Bunny-Duck. In Lucerne Valley, Ca. leader Appl. Authors: Stanley M. Nelson & Leslie W. Kangas. Rab-Pen Duck Enterprises©. ©9Nov72; BB42360 ©16Nov72;BB42381
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- The illusion in Fliegende Blätter at the University Library Heidelberg
- Rabbitduck, a sculpture by Paul St George
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