APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Smith, David C., and Angela E. Douglas. The Biology of Symbiosis. London: Arnold, 1987.

MLA (9th ed.) Citation

Smith, David C., and Angela E. Douglas. The Biology of Symbiosis. Arnold, 1987.