MacLeod, C. (1987). "Accident or Design?: George Ravenscroft's Patent and the Invention of Lead Crystal". Technology and Culture. 28 (4). Society for the History of Technology: 776–803. doi:10.2307/3105182. JSTOR3105182.
jstor.org
MacLeod, C. (1987). "Accident or Design?: George Ravenscroft's Patent and the Invention of Lead Crystal". Technology and Culture. 28 (4). Society for the History of Technology: 776–803. doi:10.2307/3105182. JSTOR3105182.