Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood (2014) The eBird/Clements checklist of birds of the world: Version 6.9 http://www.birds.cornell.edu/clementschecklist/download, läst 2015-02-01
doi.org
dx.doi.org
Bowie, R. C. K.; Fjeldså, J. & Kiure, J. 2009. "Multilocus molecular DNA variation in Winifred's Warbler Scepomycter winifredae suggests cryptic speciation and the existence of a threatened species in the Rubeho–Ukaguru Mountains of Tanzania." Ibis 151 (4): 709–719. doi:10.1111/j.1474-919X.2009.00954.x