Jelaskan dikalangan bekas busut pertahanan. dari Istana kota Orford dalam bahasa melayu

Brown, R. Allen. (1962) English Castles. London: Batsford. OCLC 1392314.

Brown, R. Allen. (2004) Allen Brown's English Castles. Woodbridge, UK: Boydell Press. ISBN 978-1-84383-069-6.

Creighton, Oliver Hamilton. (2005) Castles and Landscapes: Power, Community and Fortification in Medieval England. London: Equinox. ISBN 978-1-904768-67-8.

Hartshorne, Charles Henry. (1842) "Observations on Orford Castle", Archaeologia, Vol. 29, pp. 60–69.

Hussey, Stephen and Paul Thompson. (eds) (2004) Environmental Consciousness: the roots of a new political agenda. New Brunswick, US: Transaction. ISBN 978-0-7658-0814-1.

Heslop, T. A. (2003) "Orford Castle: nostalgia and sophisticated living," in Liddiard (ed) 2003.

James, Montague Rhodes. (2010) Suffolk and Norfolk: A Perambulation of the Two Counties.  Cambridge: Cambridge University Press. ISBN 978-1-108-01806-7.

Liddiard, Robert. (ed) (2003a) Anglo-Norman Castles. Woodbridge, UK: Boydell Press. ISBN 978-0-85115-904-1.

Liddiard, Robert. (2005) Castles in Context: Power, Symbolism and Landscape, 1066 to 1500. Macclesfield, UK: Windgather Press. ISBN 0-9545575-2-2.

Pounds, Norman John Greville. (1994) The Medieval Castle in England and Wales: a social and political history. Cambridge: Cambridge University Press. ISBN 978-0-521-45828-3.

Thompson, Paul. (2004) "The English, the Trees, the Wild and the Green: two millennia of mythological metamorphoses," in Hussey and Thompson (ed) (2004).

Varner, Gary R. (2007) Creatures in the Mist: Little People, Wild Men and Spirit Beings around the World. US: Algora. ISBN 978-0-87586-546-1.

White, William. (1855) History, Gazetteer and Directory of Suffolk. Sheffield: Robert Leader. OCLC 21834184.