APA

Crawford R. M. M., . (2008). Plants at the margin. New York, USA: Cambridge University Press.

Chicago

Crawford R M M, . 2008. Plants at the margin. New York, USA: Cambridge University Press.

Harvard

Crawford R. M. M., . (2008). Plants at the margin. New York, USA: Cambridge University Press.

MLA

Crawford R M M, . Plants at the margin. New York, USA: Cambridge University Press. 2008.