APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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