References

Visual descriptions of the Messier objects on this web sight were copied from the book "The Messier Objects" by Stephen James O'Meara. ISBN number 0-521-55332-6.

Visual descriptions of The Caldwell Catalog objects in this web sight were copied from the book "The Caldwell Objects" by Stephen James O'Meara. ISBN number 0-933346-97-2.

visual descriptions of celestial objects in this web site were written by Steven James Omera in the book "Deep Sky Companions "Hidden Treasures". ISBN number 0-521-83704-9.

Visual descriptions of the Caldwell Catalog objects on this web sight were copied from the book "Observing the Caldwell Objects" by David Ratledge. ISBN number 0-85233-628-5.

Visual descriptions for some deep sky objects on this web sight were copied from the book "Deep-Sky Wonders" by Walter Scott Houston with selections and comentary by Stephen James O'Meara. ISBN number 0-933346-93-X.

Visual description for some deep sky objects on this web site were copied from the book "Burnhams Celestial Handbook" by Robert Burnham Jr. Dover Publications New York. There are 3-volumes: Volume-1 ISBN number 0-486-24063-0, Volume-2 ISBN number 0-486-24064-9 and Volume-3 ISBN number 0-486-24065-7.

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