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Owls: A Guide to the Owls of the World. Yale University Press. ISBN 978-0-300-07920-3. König, Claus; Weick, Friedhelm; Becking, Jan-Hendrik (2010). Owls...

to the owls of the world. Yale University Press, New Haven. ISBN 978-0-300-07920-3 Lambrecht, Kálmán (1933): Handbuch der Palaeornithologie [Handbook...

"Owls: A Guide to the Owls of the World" by Claus Konig, Friedhelm Welck & Jan-Hendrik Becking. Yale University Press (1999), ISBN 978-0-300-07920-3....

the Owls of the World. United States: Yale University Press. ISBN 978-0-300-07920-3. Taylor, Marianne (2016). Brazier, Hugh (ed.). Owls: A Guide to Every...

Friedhelm Welck & Jan-Hendrik Becking. Yale University Press (1999), ISBN 978-0-300-07920-3. Neotropical Primate Conservation (2010): Long-Whiskered Owlet in...

König, C.; Weick, F.; Becking, J.H. (1999). Owls. Pica Press. ISBN 978-0-300-07920-3. Weick, F. (2006). Owls (Strigiformes): Annotated and Illustrated...

Friedhelm Welck & Jan-Hendrik Becking. Yale University Press (1999), ISBN 978-0-300-07920-3. "Elf Owl". American Bird Conservancy. Retrieved 2020-11-02. Ligon...

Owls: A Guide to the Owls of the World, Yale University Press, ISBN 978-0-300-07920-3. Eurasian Eagle Owl. Oiseaux-birds.com. Retrieved 2013-03-02. Eurasian...