Owls (Strigiformes) Annotated and Illustrated Checklist - Weick, Friedhelm; SpringerLink (Online service) (Berlin, Heidelberg : Springer-Verlag, 2006)
Keywords: Life sciences; Biodiversity; Zoology; Vertebrates; Life Sciences; Animal Systematics/Taxonomy/Biogeography; Zoology; Vertebrates; Biodiversity