APA (7th ed.) Citation

Welch, F. B. A., & Crookall, R. (1935). British regional geology: Bristol and Gloucester district. H. M. Stationery off.

Chicago Style (17th ed.) Citation

Welch, F. B. A., and Robert Crookall. British Regional Geology: Bristol and Gloucester District. London: H. M. Stationery off, 1935.

MLA (9th ed.) Citation

Welch, F. B. A., and Robert Crookall. British Regional Geology: Bristol and Gloucester District. H. M. Stationery off, 1935.