APA

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

Chicago

Harder Lawrence D, Barrett Spencer Charles Hilton, . 2006. Ecology and evolution of flowers. Oxford: Oxford University Press.

Harvard

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

MLA

Harder Lawrence D, Barrett Spencer Charles Hilton, . Ecology and evolution of flowers. Oxford: Oxford University Press. 2006.