Cracraft, J., Barker, F. K., Braun, Michael J., Harshman, J., Dyke, G., Feinstein, J., Stanely, S., Cibois, A., Schikler, P., Beresford, P., Garcia-Moreno, J., Sorenson, Michael D., Yuri, T., and Mindell, D. P. 2004. "Phylogenetic relationships among modern birds (Neornithines): Toward and avian tree of life." In Assembling the Tree of Life. Cracraft, J. and Donoghue, M. J., editors. 468–490. New York: Oxford University Press.