APA

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

Chicago

Willis K J, McElwain J C, . 2002. The evolution of plants. New York: Oxford University Press.

Harvard

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

MLA

Willis K J, McElwain J C, . The evolution of plants. New York: Oxford University Press. 2002.