APA (7th ed.) Citation

Tower of London (London, England). (1937). Authorized guide to the Tower of London (Revised edition.). H.M.S.O..

Chicago Style (17th ed.) Citation

Tower of London (London, England). Authorized Guide to the Tower of London. Revised edition. London: H.M.S.O., 1937.

MLA (9th ed.) Citation

Tower of London (London, England). Authorized Guide to the Tower of London. Revised edition. H.M.S.O., 1937.

Warning: These citations may not always be 100% accurate.