Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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