Bibliography
- Ellerman , J. R. and Morrison-Scott , T. C. S. 1951 . Checklist of Palearctic and Indian Mammals , 443
- Harrison , J. G. 1952 . A history of the Partridge in the Frisian Islands, with a description of a new subspecies from Borkum . Bull. B.O.C. , 72 : 18 – 18 . Jan. 16th, 1952.
- Mayr , E. 1942 . Systematics and the Origin of Species 1942.