2 literature references for Forpus sclateri sclateri (G. R. Gray, 1859):

Author: Dickinson, Edward C., ed.
Year: 2003
Title:
Source: The Howard and Moore Complete Checklist of the Birds of the World, 3rd edition
Author:
Year: 2006
Title:
Source: website, Zoonomen - Zoological Nomenclature Resource, 2006.12.13