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Baris 16: * '''Liebers''', Dorit; de Knijff, Peter & Helbig, Andreas J. (2004): The herring gull complex is not a ring species. ''[[Proceedings of the Royal Society#Proceedings of the Royal Society B\|Proc. Roy. Soc. B]]'' '''271'''(1542): 893-901. {{DOI\|10.1098/rspb.2004.2679}} [http://www.journals.royalsoc.ac.uk/(ck042z55y2a4k2jegtv51r45)/app/home/content.asp?referrer=contribution&format=2&page=1&pagecount=9 PDF fulltext] [http://www.journals.royalsoc.ac.uk/media/public/contributionsupplementalmaterials/v/y/h/e/vyhea7ddp48gn5a1/archive1.pdf Electronic Appendix] * '''Irwin''', D.E., Irwin, J.H., and Price, T.D. (2001): "Ring species as bridges between microevolution and speciation." ''Genetica''. 112-113: 223-243. [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11838767&dopt=Abstract PubMed] * '''Futuyma''', D. (1998) ''Evolutionary Biology''. Third edition. Sunderland, MA, Sinauer Associates.

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