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Nisbet, Ian C T; Bridge, Eli S.; Szczys, Patricia; Heidinger, Britt J (2007). „Sexual dimorphism, female-female pairs, and test for assortative mating in Common Terns”. Waterbirds. 30 (2): 169—179. JSTOR4501815. doi:10.1675/1524-4695(2007)30[169:sdfpat]2.0.co;2.