O'Donnell, Frank. Britain's £1 trillion debt mountain - How many zeros is that?. The Scotsman newspaper. 2004-07-30 [2008-01-31]. （原始内容存档于2011-03-14）. referencing Harold Wilson's 1974 decision to change government usage from the long scale billion to the short scale billion
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O'Donnell, Frank. Britain's £1 trillion debt mountain - How many zeros is that?. The Scotsman newspaper. 2004-07-30 [2008-01-31]. （原始内容存档于2011-03-14）. referencing Harold Wilson's 1974 decision to change government usage from the long scale billion to the short scale billion
