4 literature references for Anser fabalis brachyrhynchus Baillon, 1834:

Author:
Year: 1996
Title:
Source: database, NODC Taxonomic Code
Author: Mayr, Ernst, and G. William Cottrell, eds.
Year: 1979
Title:
Source: Check-List of Birds of the World, vol. 1, Second Edition
Author: American Ornithologists' Union
Year: 1983
Title:
Source: Check-list of North American Birds, 6th Edition
Author: American Ornithologists' Union
Year: 1957
Title:
Source: Check-list of North American Birds, 5th Edition