Burung walet: Perbedaan antara revisi

*[http://www.swift-conservation.org] Swift Conservation.Org free advice on the natural history and conservation of Apus apus the Common Swift

 

* {{en}} '''Chantler''', Phil & '''Driessens''', Gerald (2000): ''Swifts: a guide to the swifts and treeswifts of the world''. Pica Press, Mountfield, East Sussex. ISBN 1-873403-83-6

* {{en}} '''Thomassen''', Henri A.; Tex, Robert-Jan; de Bakker, Merijn A.G. & Povel, G. David E. (2005): Phylogenetic relationships amongst swifts and swiftlets: A multi locus approach. ''Molecular Phylogenetics and Evolution'' '''37'''(1): 264-277.