Per G.P Ericson, Cajsa L Anderson, Tom Britton, Andrzej Elzanowski, Ulf S. Johansson, Mari Källersjö, Jan I. Ohlson, Thomas J. Parsons, Dario Zuccon & Gerald Mayr. "Diversification of Neoaves:integration of molecular sequence data and fossils"(PDF). Biology Letters. 2006, 2 (4): 543–547 [2014-02-19]. (原始内容存档(PDF)于2018-05-14).
Per G.P Ericson, Cajsa L Anderson, Tom Britton, Andrzej Elzanowski, Ulf S. Johansson, Mari Källersjö, Jan I. Ohlson, Thomas J. Parsons, Dario Zuccon & Gerald Mayr. "Diversification of Neoaves:integration of molecular sequence data and fossils"(PDF). Biology Letters. 2006, 2 (4): 543–547 [2014-02-19]. (原始内容存档(PDF)于2018-05-14).