Hellmayr, Carl Eduard; Haniel, C.B. (1914). Die Avifauna von Timor (in German). Stuttgart: Im Kommissionsverlag der E. Schweizerbartschen Verlags Buchhandlung. p. 102.
books.google.com
König, Claus; Weick, Friedhelm; Becking, Jan-Hendrik (2009). Owls of the World. Helm Identification Guides. A&C Black. pp. 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.