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König, Claus; Weick, Friedhelm; Becking, Jan-Hendrik (2009). Owls of the World. Helm Identification Guides. A&C Black. с. 457—59. ISBN978-1-4081-0884-0.
Gwee, Chyi Yin; Christidis, Leslie; Eaton, James A.; Norman, Janette A.; Trainor, Colin R.; Verbelen, Phillippe; Rheindt, Frank E. (2017). Bioacoustic and multi-locus DNA data of Ninox owls support high incidence of extinction and recolonisation on small, low-lying islands across Wallacea. Molecular Phylogenetics and Evolution. 109: 246—58. doi:10.1016/j.ympev.2016.12.024. PMID28017857.
Gwee, Chyi Yin; Christidis, Leslie; Eaton, James A.; Norman, Janette A.; Trainor, Colin R.; Verbelen, Phillippe; Rheindt, Frank E. (2017). Bioacoustic and multi-locus DNA data of Ninox owls support high incidence of extinction and recolonisation on small, low-lying islands across Wallacea. Molecular Phylogenetics and Evolution. 109: 246—58. doi:10.1016/j.ympev.2016.12.024. PMID28017857.