APA
Dunn, R. R., Harris, N. C., Colwell, R. K., Koh, L. P., & Sodhi, N. S. (2009). The sixth mass coextinction: are most endangered species parasites and mutualists? Proceedings of the Royal Society B: Biological Sciences, 276, 3037–3045.
Chicago/Turabian
Dunn, Robert R, Nyeema C Harris, Robert K Colwell, Lian Pin Koh, and Navjot S Sodhi. “The Sixth Mass Coextinction: Are Most Endangered Species Parasites and Mutualists?” Proceedings of the Royal Society B: Biological Sciences 276 (2009): 3037–3045.
MLA
Dunn, Robert R., et al. “The Sixth Mass Coextinction: Are Most Endangered Species Parasites and Mutualists?” Proceedings of the Royal Society B: Biological Sciences, vol. 276, The Royal Society, 2009, pp. 3037–45.