Analysis of information sources in references of the Wikipedia article "起司堡" in Chinese language version.
|isbn=值 (帮助) （英语）.……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……
……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……