APA (7th ed.) Citation

Correvon, H., Robert, P., & Clayforth, E. W. (1911). The alpine flora. Methuen.

Chicago Style (17th ed.) Citation

Correvon, Henry, Philippe Robert, and E. W. Clayforth. The Alpine Flora. London: Methuen, 1911.

MLA (8th ed.) Citation

Correvon, Henry, et al. The Alpine Flora. Methuen, 1911.