Both spellings are used in both British and American English.«Macmillan English Dictionary». Macmillan Publishers Limited. Arxivat de l'original el 2017-01-03.[Consulta: 14 abril 2010].
Both spellings are used in both British and American English.«Macmillan English Dictionary». Macmillan Publishers Limited. Arxivat de l'original el 2017-01-03.[Consulta: 14 abril 2010].