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 Evolution36 (3): 706–721. doi:10.1016/j.ympev.2005.03.013. PMID16099384.
Schweizer, M.; Seehausen O; Güntert M; Hertwig ST (2009). «The evolutionary diversification of parrots supports a taxon pulse model with multiple trans-oceanic dispersal events and local radiations». Molecular Phylogenetics and Evolution54 (3): 984–94. doi:10.1016/j.ympev.2009.08.021. PMID19699808.
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 Evolution36 (3): 706–721. doi:10.1016/j.ympev.2005.03.013. PMID16099384.
Schweizer, M.; Seehausen O; Güntert M; Hertwig ST (2009). «The evolutionary diversification of parrots supports a taxon pulse model with multiple trans-oceanic dispersal events and local radiations». Molecular Phylogenetics and Evolution54 (3): 984–94. doi:10.1016/j.ympev.2009.08.021. PMID19699808.