Altevogt (1959), Altevogt (1962)†, Barea-Azcón et al. (2008), Barnwell & Martini (1993), Bright & Hogue (1972)†, Crane (1975)†, de Gibert et al. (2013)†, DelValls et al. (1999), Drews & Graszynski (1987), Eibl-Eibesfeldt & Sielmann (1964), Feest (1969)†, González-Gordillo & Rodríguez (2003), Heinrich (1971), Hyatt (1973)†, Hyatt (1975)†, Korte (1966)†, Krippeit-Drews et al. (1989), Lucu (1990)†, Pinoni et al. (2018)†, Salmon (1965)†, Salmon (1967)†, Salmon & Atsaides (1968)†, Spivak & Cuesta (2009)†, Suñer et al. (1999), von Hagen (1961)
Entries marked with † represent indirect references to location through citation.