Birdlife Species Factsheet: . Hentet ut 6. september 2013. Clements, J. F., T. S. Schulenberg, M. J. Iliff, B.L. Sullivan, C. L. Wood, and D. Roberson. 2013. . Hentet ut 6. september 2013. IBC - The Internet Bird Collection: . Hentet ut 6. september 2013.