(en) Ewen, John G.et al. 2006. Systematic affinities of two enigmatic New Zealand passerines of high conservation priority, the hihi or stitchbird Notiomystis cincta and the kokako Callaeas cinerea.Molecular Phylogenetics and Evolution 40(1):281–284. full text. Gearchiveerd op 9 juni 2023.
(en) Ewen, John G.et al. 2006. Systematic affinities of two enigmatic New Zealand passerines of high conservation priority, the hihi or stitchbird Notiomystis cincta and the kokako Callaeas cinerea.Molecular Phylogenetics and Evolution 40(1):281–284. full text. Gearchiveerd op 9 juni 2023.