APA (7th ed.) Citation

Great Britain. Ordnance Survey, Pearson, R., Mitchell, S., & Hunt, C. (1987). The Ordnance Survey guide to gardens in Britain (First American edition.). Norton.

Chicago Style (17th ed.) Citation

Great Britain. Ordnance Survey, Robert Pearson, Susanne Mitchell, and Candida Hunt. The Ordnance Survey Guide to Gardens in Britain. First American edition. New York: Norton, 1987.

MLA (9th ed.) Citation

Great Britain. Ordnance Survey, et al. The Ordnance Survey Guide to Gardens in Britain. First American edition. Norton, 1987.