Gaya APA

Walker, M. et al (2008). The relative importance of resources and natural enemies in determining herbivore abundance: thistles, tephritids and parasitoids . London: British Ecological Society.

Gaya MLA

Walker, Matthew. et al. "The relative importance of resources and natural enemies in determining herbivore abundance: thistles, tephritids and parasitoids". London: British Ecological Society, 2008. e-journal.