Credit/Permission: Anonymous artist, Popular Science Monthly, Volume 32, 1887--1888 (uploaded to Wikisource by User:Ineuw, 2010) / Public domain.
Image link: Wikisource: File:PSM V32 D527 Ursa major draco and cygnus on the northern sky.jpg.
Local file: local link: sky_map_winter.html.
File: Sky maps file: sky_map_winter.html.