APA (7th ed.) Citation

Clapham, A. R., Tutin, T. G., Warburg, E. F., & Roles, S. J. (1957). Flora of the British Isles: Illustrations. University Press.

Chicago Style (17th ed.) Citation

Clapham, A. R., T. G. Tutin, E. F. Warburg, and Sybil J. Roles. Flora of the British Isles: Illustrations. Cambridge [England]: University Press, 1957.

MLA (9th ed.) Citation

Clapham, A. R., et al. Flora of the British Isles: Illustrations. University Press, 1957.