The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- Banks, R. C., R. W. McDiarmid, A. L. Gardner, and W. C. Starnes. 2003. Checklist of Vertebrates of the United States, the U.S. Territories, and Canada
- Banks, R. C., R. W. McDiarmid, and A. L. Gardner. 1987. Checklist of Vertebrates of the United States, the U.S. Territories, and Canada. Resource Publication, no. 166. 79
- Fry, C.H., S. Keith & E.K. Urban (1988). The Birds of Africa, Volume III. Academic Press, London.
- WoRMS (2014). Apus. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=206119
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