Barker FK (2011) Phylogeny and diversification of modern passerines. In: Dyke GJ & Kaiser GW (eds) <i>Living dinosaurs: the evolutionary history of modern birds</i>: 235-256. John Wiley & Sons, Chichester.
Barraclough TG, Nee S & Harvey PH (1998) Sister-group analysis in identifying correlates of diversification. Evol Ecol 12: 751-754.
Collias NE (1997) On the origin and evolution of nest building by passerine birds. Condor 99: 253-270.