Cita APA

Johnson, k. R., & Nichols, D. J. (2008). Plants and the k-t boundary. Cambridge.

Chicago Edition Citation

Johnson, kirk R., i Douglas J. Nichols. Plants and the K-t Boundary. New York: Cambridge, 2008.

Cita MLA

Johnson, kirk R., i Douglas J. Nichols. Plants and the K-t Boundary. Cambridge, 2008.