Guinnane, Timothy W. (enero de 2004). «Vergangenheitsbewältigung: the 1953 London Debt Agreement»(PDF). Center Discussion Paper no. 880. Economic Growth Center, Yale University. Consultado el 6 de diciembre de 2008. «At the pre-World War I parities, $1 gold = 4.2 gold Marks. One Mark was worth one shilling sterling.»
