1. Archivo Histórico Banco Nacional de Mexico Mexico
2. Archivos Económicos Sección Bancos. Biblioteca Lerdo de Tejada, Secretaria de Hacienda y Crédito Público Mexico
3. FindLaw/US Supreme Court Opinions and Website (US)http://caselaw.lp.findlaw.com/scripts/getcase.pl?navby=search&court=US&case=/us/374/321.html#f2accessed on 9 January, 2003
4. Lloyds-TSB Scotland Archive Glasgow University Archive Service, University of Glasgow UKhttp://www.archives.gla.ac.uk/arcbrc/resource/collects/business/bcindx-a.htmlaccessed on 26 October, 2001
5. Nationwide Society Archives Wellingborough, Nationwide Building Society UK