1. Development of voluntary control.
2. Bell, C. 1821. "On the Nerves Giving an Account of Some Experiments on Their Structure and Function, Which Lead to a New Arrangement of the System."
3. Fedorov, V. K. 1955. Fiziologicheskie osobennosti dvigatel'nogo analizatora sobaki. Leningrad.
4. Conditioning and the Voluntary Control of the Pupillary Light Reflex