* [https://web.archive.org/web/20130614014314/http://www.pensandwatches.com/_pages/pen_company_photos/bankers_pen_company.htm] Pagina dal sito dismesso Pen & Watches
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* http://www.richardspens.com/ref/gloss/B.htm
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* [http://www.richardspens.com/ref/gloss/B.htm] Voce del glossario di Richard Binder