Székely, T.; Reynolds, J.D.; Figuerola, J. (2000), "Sexual Size Dimorphism In Shorebirds, Gulls, And Alcids: The Influence Of Sexual And Natural Selection", Evolution, 54 (4): 1404–1413, doi:10.1554/0014-3820(2000)054[1404:SSDISG]2.0.CO;2, PMID11005306
Székely, T.; Reynolds, J.D.; Figuerola, J. (2000), "Sexual Size Dimorphism In Shorebirds, Gulls, And Alcids: The Influence Of Sexual And Natural Selection", Evolution, 54 (4): 1404–1413, doi:10.1554/0014-3820(2000)054[1404:SSDISG]2.0.CO;2, PMID11005306