Christidis, L., L.; Schodde, R.; Shaw, D. D.; Maynes, S. F. (1991). "Christidis, L., R. Schodde, D. D. Shaw, and S. F. Maynes. 1991. Relationships among the Australo-Papuan parrots, lorikeets, and cockatoos (Aves, Psittaciformes) - protein evidence". Condor. 93: 302–317. doi:10.2307/1368946. JSTOR1368946.
de Kloet, RS; de Kloet SR (2005). "The evolution of the spindlin gene in birds: Sequence analysis of an intron of the spindlin W and Z gene reveals four major divisions of the Psittaciformes". Molecular Phylogenetics and Evolution. 36 (3): 706–721. Bibcode:2005MolPE..36..706D. doi:10.1016/j.ympev.2005.03.013. PMID16099384.
de Kloet, RS; de Kloet SR (2005). "The evolution of the spindlin gene in birds: Sequence analysis of an intron of the spindlin W and Z gene reveals four major divisions of the Psittaciformes". Molecular Phylogenetics and Evolution. 36 (3): 706–721. Bibcode:2005MolPE..36..706D. doi:10.1016/j.ympev.2005.03.013. PMID16099384.
Christidis, L., L.; Schodde, R.; Shaw, D. D.; Maynes, S. F. (1991). "Christidis, L., R. Schodde, D. D. Shaw, and S. F. Maynes. 1991. Relationships among the Australo-Papuan parrots, lorikeets, and cockatoos (Aves, Psittaciformes) - protein evidence". Condor. 93: 302–317. doi:10.2307/1368946. JSTOR1368946.
de Kloet, RS; de Kloet SR (2005). "The evolution of the spindlin gene in birds: Sequence analysis of an intron of the spindlin W and Z gene reveals four major divisions of the Psittaciformes". Molecular Phylogenetics and Evolution. 36 (3): 706–721. Bibcode:2005MolPE..36..706D. doi:10.1016/j.ympev.2005.03.013. PMID16099384.