1970–1992Arxivat 2008-10-13 a Wayback Machine.. 1980 derived from AUD-USD=1.1055 and AUD-GBP=0.4957 at end of Dec 1979: 0.4957/1.1055=0.448394392; 1985 derived from AUD-USD=0.8278 and AUD-GBP=0.7130 at end of Dec 1984: 0.7130/0.8278=0.861319159
«Paper Money Glossary». Littleton Coin Company. Arxivat de l'original el 12 de gener 2012. [Consulta: 7 novembre 2011].
1970–1992Arxivat 2008-10-13 a Wayback Machine.. 1980 derived from AUD-USD=1.1055 and AUD-GBP=0.4957 at end of Dec 1979: 0.4957/1.1055=0.448394392; 1985 derived from AUD-USD=0.8278 and AUD-GBP=0.7130 at end of Dec 1984: 0.7130/0.8278=0.861319159
worldcat.org
«Ask Us» (en anglès). National Geographic, 6-2002, pàg. 1. ISSN: 0027-9358 [Consulta: 19 abril 2013].