Flora of the British Isles,
by A. R. Clapham, T. G. Tutin and E. F. Warburg.

APA Citation

Clapham, A. R. (Arthur Roy)., Warburg, E. F., Tutin, T. G. (Thomas Gaskell). (1962). Flora of the British Isles. 2d ed. Cambridge [Eng.]: University Press.

MLA Citation

Clapham, A. R. (Arthur Roy), 1905-, E. F Warburg, and T. G. (Thomas Gaskell) Tutin. Flora of the British Isles. 2d ed. Cambridge [Eng.]: University Press, 1962.