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4 Laiolo P, "The evolution of vocalisations in the genus Corvus: effects of phylogeny, morphology and habitat" 17 : 111-123, 2003
5 Laland KN, "The animal cultures debate" 21 : 542-547, 2006
6 Kroodsma D, "The Singing Life of Birds: The Art and Science of Listening to Birdsong" Houghton Mifflin Company 2005
7 Birkhead TR, "The Magpies: The Ecology and Behaviour of Black-billed and Yellow-billed Magpies" T&AD Poyser 1991
8 Date EM, "Sound transmission: a basis for dialects in birdsong" 124 : 291-312, 1993
9 Kim YP, "Restructuring Mountain Systems in Korean Peninsula: Focusing on Mountain Range Analysis" Korea Research Institute for Human Settlements 2004
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