Lionel Clark Sternberg obituaryArkiveret 23. august 2013 hos Wayback MachineTimes. 07-02-1964. "…at the hungry age of 16, [Sternberger] experimentally dropped a slice of American cheese on a sizzling hamburger while helping out at his father's sandwich shop in Pasadena, thereby inventing the cheeseburger…" Hentet ( 13/08/2013).
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Lionel Clark Sternberg obituaryArkiveret 23. august 2013 hos Wayback MachineTimes. 07-02-1964. "…at the hungry age of 16, [Sternberger] experimentally dropped a slice of American cheese on a sizzling hamburger while helping out at his father's sandwich shop in Pasadena, thereby inventing the cheeseburger…" Hentet ( 13/08/2013).
"The Tale of the Cheeseburger". San Gabriel Valley Tribune. 1999-06-23. Arkiveret fra originalen den 2003. Hentet 13. august 2013.{{cite news}}: CS1-vedligeholdelse: BOT: original-url status ukendt (link)