APA (7th ed.) Citation

Ordnance Survey. (1978). One-inch and 1: 50000 geological maps of England and Wales. Ordnance Survey.

Chicago Style (17th ed.) Citation

Ordnance Survey. One-inch and 1: 50000 Geological Maps of England and Wales. Ordnance Survey, 1978.

MLA (9th ed.) Citation

Ordnance Survey. One-inch and 1: 50000 Geological Maps of England and Wales. Ordnance Survey, 1978.

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