APA (7th ed.) Citation

Elles, G. L., Shakespear, E. M. R. W., & Lapworth, C. (1901). A monograph of British graptolites.

Chicago Style (17th ed.) Citation

Elles, G. L., Ethel M. R. Wood Shakespear, and Charles Lapworth. A Monograph of British Graptolites. 1901.

MLA (9th ed.) Citation

Elles, G. L., et al. A Monograph of British Graptolites. 1901.