APA (7th ed.) Citation

Smith, D. C., & Douglas, A. E. (1987). The biology of symbiosis. E. Arnold.

Chicago Style (17th ed.) Citation

Smith, D. C., and A. E. Douglas. The Biology of Symbiosis. London ; Baltimore, Md., U.S.A.: E. Arnold, 1987.

MLA (8th ed.) Citation

Smith, D. C., and A. E. Douglas. The Biology of Symbiosis. E. Arnold, 1987.