APA (7th ed.) Citation

Crundwell, A. C., & Warburg, E. F. (1959). Tortula virescens, De Not. De Not. new to the British Isles ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Crundwell, A. C., and Edmund Fredric Warburg. Tortula Virescens, De Not. De Not. New to the British Isles. [Sonderdr.]. 1959.

MLA (9th ed.) Citation

Crundwell, A. C., and Edmund Fredric Warburg. Tortula Virescens, De Not. De Not. New to the British Isles. [Sonderdr.]. 1959.