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
Turner, A. (2020). Pearl-breasted Swallow (Hirundo dimidiata), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.pebswa1.01
