Norman, Janette A; Christidis, L; Westerman, M; Hill, F.A. Richard (1998). "Molecular data confirms the species status of the Christmas Island hawk-owl Ninox natalis.". Emu. 98 (3): 197–208. Bibcode:1998EmuAO..98..197N. doi:10.1071/MU98028.
Hill, F.A. Richard; Lill, Alan (1998). "Vocalisations of the Christmas Island hawk-owl Ninox natalis: Individual variation in advertisement calls". Emu. 98 (3): 221–226. doi:10.1071/MU98030.
Hill, F.A. Richard; Lill, Alan (1998). "Density and total population estimates for threatened Christmas Island hawk-owl Ninox natalis". Emu. 98 (3): 209–220. Bibcode:1998EmuAO..98..209H. doi:10.1071/MU98029.
Hill, F.A. Richard; Lill, Alan (1998). "Diet and roost site characteristics of the Christmas Island hawk-owl Ninox natalis". Emu. 98 (3): 227–233. Bibcode:1998EmuAO..98..227H. doi:10.1071/MU98031.
Phillips, D.J.; Olsen, P.D; Rentz, D; Lawrence, J (1991). "Observations on the diet of the Christmas Island hawk-owl Ninox squamipila natalis". Emu. 91 (4): 250–251. Bibcode:1991EmuAO..91..250P. doi:10.1071/MU9910250.
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Norman, Janette A; Christidis, L; Westerman, M; Hill, F.A. Richard (1998). "Molecular data confirms the species status of the Christmas Island hawk-owl Ninox natalis.". Emu. 98 (3): 197–208. Bibcode:1998EmuAO..98..197N. doi:10.1071/MU98028.
Hill, F.A. Richard; Lill, Alan (1998). "Density and total population estimates for threatened Christmas Island hawk-owl Ninox natalis". Emu. 98 (3): 209–220. Bibcode:1998EmuAO..98..209H. doi:10.1071/MU98029.
Hill, F.A. Richard; Lill, Alan (1998). "Diet and roost site characteristics of the Christmas Island hawk-owl Ninox natalis". Emu. 98 (3): 227–233. Bibcode:1998EmuAO..98..227H. doi:10.1071/MU98031.
Phillips, D.J.; Olsen, P.D; Rentz, D; Lawrence, J (1991). "Observations on the diet of the Christmas Island hawk-owl Ninox squamipila natalis". Emu. 91 (4): 250–251. Bibcode:1991EmuAO..91..250P. doi:10.1071/MU9910250.