Ansara-Ross, T. M.; Ross, M. J.; Wepener, V. (August 2013). "The use of feathers in monitoring bioaccumulation of metals and metalloids in the South African endangered African grass-owl (Tyto capensis)". Ecotoxicology. 22 (6): 1072–1083. Bibcode:2013Ecotx..22.1072A. doi:10.1007/s10646-013-1095-4. ISSN0963-9292. PMID23793347.
Ansara-Ross, T. M.; Ross, M. J.; Wepener, V. (August 2013). "The use of feathers in monitoring bioaccumulation of metals and metalloids in the South African endangered African grass-owl (Tyto capensis)". Ecotoxicology. 22 (6): 1072–1083. Bibcode:2013Ecotx..22.1072A. doi:10.1007/s10646-013-1095-4. ISSN0963-9292. PMID23793347.
Ansara-Ross, T. M.; Ross, M. J.; Wepener, V. (August 2013). "The use of feathers in monitoring bioaccumulation of metals and metalloids in the South African endangered African grass-owl (Tyto capensis)". Ecotoxicology. 22 (6): 1072–1083. Bibcode:2013Ecotx..22.1072A. doi:10.1007/s10646-013-1095-4. ISSN0963-9292. PMID23793347.
Ansara-Ross, T. M.; Ross, M. J.; Wepener, V. (August 2013). "The use of feathers in monitoring bioaccumulation of metals and metalloids in the South African endangered African grass-owl (Tyto capensis)". Ecotoxicology. 22 (6): 1072–1083. Bibcode:2013Ecotx..22.1072A. doi:10.1007/s10646-013-1095-4. ISSN0963-9292. PMID23793347.