APA (7th ed.) Citation

Clapham, A. R., Tutin, T. G., & Warburg, E. F. (1981). Excursion flora of the British Isles / by A.R. Clapham, T.G. Tutin and E.F. Warburg (3rd ed.). C.U.P..

Chicago Style (17th ed.) Citation

Clapham, A. R., T. G. Tutin, and E. F. Warburg. Excursion Flora of the British Isles / by A.R. Clapham, T.G. Tutin and E.F. Warburg. 3rd ed. C.U.P., 1981.

MLA (9th ed.) Citation

Clapham, A. R., et al. Excursion Flora of the British Isles / by A.R. Clapham, T.G. Tutin and E.F. Warburg. 3rd ed. C.U.P., 1981.

Warning: These citations may not always be 100% accurate.