List of 11 bird species including the raven c. 3.000 BC (W 21229), in Robert K. Englund and Hans J. Nissen 1993 Die lexikalischen Listen der archaischen Texte aus Uruk
Carolus Linnaeus 1758 List of crow species, in Systema naturae, 10th ed
Georg Toepfer 1981 List of song birds observed, Notebook
List of raven species 2016, Enyclopedia of Life (online)
