APA (7th ed.) Citation

Elles, G. L., & Wood, E. M. R. (1901). A monograph of British Graptolites.

Chicago Style (17th ed.) Citation

Elles, Gertrude L., and Ethel M. R. Wood. A Monograph of British Graptolites. London, 1901.

MLA (9th ed.) Citation

Elles, Gertrude L., and Ethel M. R. Wood. A Monograph of British Graptolites. 1901.