APA (7th ed.) Citation

(1921). Authorised guide to the tower of London. Barclay.

Chicago Style (17th ed.) Citation

Authorised Guide to the Tower of London. London: Barclay, 1921.

MLA (9th ed.) Citation

Authorised Guide to the Tower of London. Barclay, 1921.

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