Suthers, R.A. "Contributions to the morphology of the syrinx and the sound-producing mechanisms in the avian vocal tract". Journal of Morphology. 259 (2). 2004: 154–172. doi:10.1002/jmor.10181. PMID14716597.
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Suthers, R.A. "Contributions to the morphology of the syrinx and the sound-producing mechanisms in the avian vocal tract". Journal of Morphology. 259 (2). 2004: 154–172. doi:10.1002/jmor.10181. PMID14716597.