Oberg, Erik; Jones, Franklin Day (1917). Machinery's Encyclopedia. The Industrial Press. p. 412. The alloy came originally from China, where its composition is said to have been known.
ascasonline.org
"Marks of Alpacca and Alpacca-Silver II products". Association of Small Collectors of Antique Silver (ASCAS) (Ascasonline.org). Marks of Berndorf Metalware Factory in Austria. Retrieved 19 December 2013.
Gayle, Margot; Look, David W.; Waite, John G. (April 1993). "Pt. 1, A Historical Survey of Metals; Pt. 2, Deterioration and Methods of Preserving Metals". Metals in America's Historic Buildings: Uses and preservation 5reatments. Cultural Resources, Preservation Assistance. U.S. Department of the Interior, National Park Service. p. 35. ISBN978-0-16-061655-6 – via Google books.
