"Der Eierschneider war ein Welterfolg" [The Egg Slicer was a World-Wide Success]. Berliner Zeitung (in German). April 23, 1997. Archived from the original on June 27, 2015. Retrieved December 1, 2015.
books.google.com
Sinclair, Charles G., ed. (1998). "Egg slicer". The International Dictionary of Food and Cooking. Peter Collin. p. 184. ISBN978-1-57958-057-5. Retrieved December 11, 2009.
"Der Eierschneider war ein Welterfolg" [The Egg Slicer was a World-Wide Success]. Berliner Zeitung (in German). April 23, 1997. Archived from the original on June 27, 2015. Retrieved December 1, 2015.