APA (7th ed.) Citation

Great Britain. Ordnance Survey. (1842). [Six-inch topographic map of England and Wales]. Ordnance Survey.

Chicago Style (17th ed.) Citation

Great Britain. Ordnance Survey. [Six-inch Topographic Map of England and Wales]. Southampton: Ordnance Survey, 1842.

MLA (8th ed.) Citation

Great Britain. Ordnance Survey. [Six-inch Topographic Map of England and Wales]. Ordnance Survey, 1842.

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