A schematic of the HMS Inflexible
depicting her rectangular citadel in the centre.
In a ship an armored citadel is an armored box enclosing the machinery and magazine spaces. It was formed by the armored deck, the waterline belt and the transverse bulkheads.
- ^ Raven and Roberts, p. 9
- Raven, Alan; Roberts, John (1980). British Cruisers of World War Two. Annapolis, MD: Naval Institute Press. ISBN 0-87021-922-7.