( 1) General reference
Fullbrook Leggatt L E W O. 1952. Anglo Saxon and Medieval Gloucester
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( 2) R Allen Brown, H M Colvin and A J Taylor 1963 The history of the King's Works, volume 2 : the Middle Ages
1963 Page(s)651-56
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( 3) General reference
Hall and Pinnell's Map of Gloucester 1780
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( 4) General reference
Lobel M. 1969. Historic Towns 1
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(5) by Carolyn Heighway 1985 Gloucester : a history and guide
Reconstruction drawing of the castle circa 1140 on p49 Page(s)48
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(6) Fortress : the castles and fortifications quarterly
9, MAY, 1991 Page(s)20-3
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