APA (7th ed.) Citation

Great Britain. Ordnance Survey. (1951). Ordnance survey national grid plans, scale 1: 1250 [Westminster]. Ordnance Survey.

Chicago Style (17th ed.) Citation

Great Britain. Ordnance Survey. Ordnance Survey National Grid Plans, Scale 1: 1250 [Westminster]. Chessington, Surrey: Ordnance Survey, 1951.

MLA (9th ed.) Citation

Great Britain. Ordnance Survey. Ordnance Survey National Grid Plans, Scale 1: 1250 [Westminster]. Ordnance Survey, 1951.

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