APA (7th ed.) Citation

Clapham, A. R. (1962). Flora of the British Islas. The University Press.

Chicago Style (17th ed.) Citation

Clapham, A. R. Flora of the British Islas. Cambridge: The University Press, 1962.

MLA (9th ed.) Citation

Clapham, A. R. Flora of the British Islas. The University Press, 1962.