found: Jansson, G. The long-tailed tit (Aegithalos caudatus) as an indicator for the distribution of deciduous forest in boreal landscapes, c1997.
found: Gruson cklist. world's birds:p. 138 (Aegithalos caudatus, Long-tailed tit)
found: Ehrlich, P.R. The birdwatcher's handbook, 1994:p. 424 (Long-tailed tit, Aegithalos caudatus)
found: Snow, D.W. The birds of the western Palearctic, 1998:v. 2, p. 1372 (Long-tailed Tit, Aegithalos caudatus)
found: Howard birds world:p. 409 (Aegithalos caudatus (Long-tailed Tit))
found: Monroe, B.L. A world cklist. of birds, c1993:p. 245 (Aegithalos caudatus, Long-tailed tit)