APA (7th ed.) Citation

Great Britain. Ordnance Survey. (1958). 1: 25 000 first series. Ordnance Survey.

Chicago Style (17th ed.) Citation

Great Britain. Ordnance Survey. 1: 25 000 First Series. Chessington, Surrey: Ordnance Survey, 1958.

MLA (9th ed.) Citation

Great Britain. Ordnance Survey. 1: 25 000 First Series. Ordnance Survey, 1958.

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