APA (7th ed.) Citation

Harley, J. B. (1975). Ordnance survey maps: A descriptive manual. Ordnance Survey.

Chicago Style (17th ed.) Citation

Harley, J. B. Ordnance Survey Maps: A Descriptive Manual. Southhampton, UK: Ordnance Survey, 1975.

MLA (9th ed.) Citation

Harley, J. B. Ordnance Survey Maps: A Descriptive Manual. Ordnance Survey, 1975.

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