Docherty, P. The Visual Dictionary of the Universe
Published by Dorling Kindersley Inc. New York, NY (1993)

Kerrod, R. The Universe
Published by Warwick Press (1975)

Lambert D. The Solar System
Published by The Bookwright Press (1984)

Lauber, P. Journey to the Planets
Published by Crown Publishers Inc.(1982)

Aronson, B. Eclipses
Published by Grolier Publishing. Danbury, CT (1996)

Bredson, C. The Moon
Published by Grolier Publishing. Danbury CT (1998)

Hatchett, C. Stars and Galaxies
Published by Grolier Educational. Danbury, CT (1998)

Simon, S. Galaxies
Published by Morrow Junior Books. New York, NY (1988)

Wilding-White, T. All About UFOs
Published by Usborne Publishing. London, England (1977)

Branley, F. Star Guide
Published by Thomas Y. Crowell. New York, NY (1987)

Bonar, S. Comets
Published by Grolier Publishing Danbury,CT (1998)

Jefferis, D. Alein Lifesearch- Quest for Extraterrestrial Life
Published by Crabtree Publishing Company New York, NY (1999)

Marsh, C. Unidentified Flying Objects and Extraterrestrial Life
Published by Henry Holt and Company New York, NY (1996)

Asimov I. UFOs: True Mysteries or Hoaxes
Published by Gareth Stevens Publishing

Gregor, S. A. Galileo Galilei
Published by The Macmillan Company New York, NY
Microsoft Encarta 98 Encyclopedia
Published by Microsoft Corporation Redmond, WA



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