( 1) Ordnance Survey Map (Scale / Date)
OS 6" NSL
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( 2) General reference
Longthorpe Tower: MPBW Guide 1964 (E Clive Rouse)
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( 3) Society of Antiquaries of London Archaeologia : or miscellaneous tracts relating to antiquity
XCVI Page(s)1-57
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( 4) Scheduled Monument Notification
10-OCT-1995
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( 5) List of Buildings of Special Architectural or Historic Interest
Peterborough, 07-MAY-1973 819
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(6) Country Life
CI Page(s)604
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(7) 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)319
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(8) Caroline Babington, Tracy Manning and Sophie Stewart 1999 Our painted past : wall paintings of English Heritage
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