Cita APA (7a ed.)

Erwin, D. H. (2008). Extinction: How life on earth nearly ended 250 million years ago (4th ed.). Princeton university press.

Cita Chicago Style (17a ed.)

Erwin, Douglas H. Extinction: How Life on Earth Nearly Ended 250 Million Years Ago. 4th ed. Princeton: Princeton university press, 2008.

Cita MLA (8a ed.)

Erwin, Douglas H. Extinction: How Life on Earth Nearly Ended 250 Million Years Ago. 4th ed. Princeton university press, 2008.