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. PMID16099384. doi:10.1016/j.ympev.2005.03.013.
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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. PMID16099384. doi:10.1016/j.ympev.2005.03.013.