Burke, William and Levy, Yvonne. "Silver: End of an Era : No Longer Money," in Federal Reserve Bank of San Francisco. "November 1973 Supplement : Silver: End of an Era," Economic Review (Federal Reserve Bank of San Francisco) (November 1973) : 18-25. https://fraser.stlouisfed.org/title/869/item/520329/toc/513997 , accessed on May 4, 2024.