APA (7th ed.) Citation

Ordnance Survey of England and Wales. (1928). Ordnance Survey physical map of England and Wales: Magnetic edition.

Chicago Style (17th ed.) Citation

Ordnance Survey of England and Wales. Ordnance Survey Physical Map of England and Wales: Magnetic Edition. 1928.

MLA (9th ed.) Citation

Ordnance Survey of England and Wales. Ordnance Survey Physical Map of England and Wales: Magnetic Edition. 1928.

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