APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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