( 1) Ordnance Survey Map (Scale / Date)
OS 1:2500 1965
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( 2) Royal Archaeological Institute The Archaeological Journal
B Green 137, 1980 Page(s)358-9
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( 3) by Derek Renn 1973 Norman castles in Britain
Page(s)259-62
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( 4) Norfolk and Norwich Archaeological Society Norfolk archaeology : a journal of archaeology and local history
36, 1974 Page(s)68
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( 5) List of Buildings of Special Architectural or Historic Interest
DOE (HHR) City & Cty of Norwich 1972 1
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(6) Oral information, correspondence (not archived) or staff comments
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(7) R Allen Brown, H M Colvin and A J Taylor 1963 The history of the King's Works, volume 2 : the Middle Ages
Page(s)753-5
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(8) Peter Kent 1988 Fortifications of East Anglia
Page(s)182
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(9) Oral information, correspondence (not archived) or staff comments
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