We think that the best atlas for this is the Cambridge Star Atlas. According to the constellation boundaries of the IAU the sky is divided into 88 single constellations. The Deep-Sky Corner has the same structure. Depending on source material and date, objects close to the constellation boundaries may change their affiliation from one to another. The thumbnails and larger charts all have the same scale to show their different areas and sizes.
North is up on all charts.
The images shown here are generally the best we have found or taken ourselves. Their sources are credited in the legend text or in the image itself. Of course, this does not apply to the other images. Sometimes we found differing or contradictory data about an object and mentioned it then. If we found more accurate data we used that.