Excursion 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). (1968). Excursion flora of the British Isles. 2nd ed. Cambridge: Cambridge U.P..

MLA Citation

Clapham, A. R. (Arthur Roy), 1905-, E. F. Warburg, and T. G. (Thomas Gaskell) Tutin. Excursion Flora of the British Isles. 2nd ed. Cambridge: Cambridge U.P., 1968.