APA (7th ed.) Citation

Clapham, A. R. (1952). Flora of the British Isles. University Press.

Chicago Style (17th ed.) Citation

Clapham, A. R. Flora of the British Isles. Cambridge [England]: University Press, 1952.

MLA (9th ed.) Citation

Clapham, A. R. Flora of the British Isles. University Press, 1952.