De la Bédoyère, Guy: English Heritage Book of Roman Towns in Britain, s. 67. (A Batsford book) Rowman & Littlefield, 1992. ISBN 9780713468939Teoksen verkkoversio.
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Smith, William: ”Britannicae Insulae or Britannia”, Dictionary of Greek and Roman Geography. Boston: Little, Brown and Company, 1854. Teoksen verkkoversio. (englanniksi)