APA

Harder L. D., Barret S. C. H., . (2006). Ecology and evolution of flowers. New York: Oxford University Press.

Chicago

Harder Lawrence D, Barret Spencer C H, . 2006. Ecology and evolution of flowers. New York: Oxford University Press.

Harvard

Harder L. D., Barret S. C. H., . (2006). Ecology and evolution of flowers. New York: Oxford University Press.

MLA

Harder Lawrence D, Barret Spencer C H, . Ecology and evolution of flowers. New York: Oxford University Press. 2006.