APA

Erwin D. H., . (2006). Extinction how life on earth nearly ended 250 million years ago. New Jersey: Princeton University Press.

Chicago

Erwin Douglas H, . 2006. Extinction how life on earth nearly ended 250 million years ago. New Jersey: Princeton University Press.

Harvard

Erwin D. H., . (2006). Extinction how life on earth nearly ended 250 million years ago. New Jersey: Princeton University Press.

MLA

Erwin Douglas H, . Extinction how life on earth nearly ended 250 million years ago. New Jersey: Princeton University Press. 2006.