Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood (2017) The eBird/Clements checklist of birds of the world: Version 2017 http://www.birds.cornell.edu/clementschecklist/download, läst 2017-08-11
Thais L. F. Martins: Low incidence of extra-pair paternity in the colonially-nesting swift (Apus apus) revealed by DNA fingerprinting; Journal of Avian Biology 33:441–446; Uncorrected ProofArkiverad 31 oktober 2008 hämtat från the Wayback Machine.
Thais L. F. Martins: Low incidence of extra-pair paternity in the colonially-nesting swift (Apus apus) revealed by DNA fingerprinting; Journal of Avian Biology 33:441–446; Uncorrected ProofArkiverad 31 oktober 2008 hämtat från the Wayback Machine.