APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Willis K.J and J.C McElwain. The Evolution of Plants. 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.