APA (7th ed.) Citation

Willis, K. J., & McElwain, J. C. (2002). The evolution of plants. Oxford University Press.

Chicago Style (17th ed.) Citation

Willis, K. J., and J. C. McElwain. The Evolution of Plants. Oxford ; New York: Oxford University Press, 2002.

MLA (9th ed.) Citation

Willis, K. J., and J. C. McElwain. The Evolution of Plants. Oxford University Press, 2002.