1. De, Boer, L. E. M., 1984. New developments in vertebrate cytotaxonomy. VIII A current list of references on a vian karyology. Genetica 65: 3?37.
2. De, Boer, L. E. M. & Belterman, R. H. R., 1980. The somatic chromosomes of three parrots: the kea (Nestor notabilis), the yellow-headed parrot (Amazona ochrocephala) and the grey parrot (Psittacus erithacus). Acta zool. pathol. antuerpiensia 75: 9?18.
3. Forshaw, J. M., 1973. Parrots of the World. Melbourne. Landsdowne, 1973.
4. Giannoni, M. L.; Giannoni, M.A. and Ferrari, I., 1986. Citogenética Aplicada às Aves: Técnicas. FEALO. 33?34pp.
5. Scheres, J. M., 1972. Human chromosome banding. Lancet 1: 849.