( 1) Ordnance Survey Map (Scale / Date)
OS 6" 1899
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( 2) Royal Commission on Historical Monuments (England) 1910 An inventory of the historical monuments in Hertfordshire
Page(s)35
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( 3) Annotated Record Map
Corr 6" (J Holmes 1951)
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( 4) Field Investigators Comments
F1 JRL 06-FEB-75
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( 5) General reference
Mediaeval Castles of Hertfordshire 1971 13 (D Renn)
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(6) by David J Cathcart King 1983 Castellarium anglicanum : an index and bibliography of the castles in England, Wales and the islands. Volume I : Anglesey - Montgomery
Page(s)219
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