3 literature references for Emberiza rustica rustica Pallas, 1776:

Author:
Year: 1996
Title:
Source: database, NODC Taxonomic Code
Author: Dickinson, Edward C., ed.
Year: 2003
Title:
Source: The Howard and Moore Complete Checklist of the Birds of the World, 3rd edition
Author: American Ornithologists' Union
Year: 1957
Title:
Source: Check-list of North American Birds, 5th Edition