1. National Aeronautics and Space Administration – NASA
  2. Introduction to Astronomy
  3. Advanced studies and research on flat and mountainous effect found on Venus –
    Planetary Explorations and Images Display at NASA Headquarter Washington D.C.
  4. D.R. Wilkins and S.J. Crass University of Cambridge – Institute of Astronomy “2009 – 2015 Institute of Astronomy, University of Cambridge”
  5. The Universe – “Big Bang Nucleosynthesis” (Consist of solutions to equations related rare gases).
  6. The Usborne, Carrie A. Seay, Dr. Janet Mercer [2002] The Usborne Internet-Linked Library of Science EARTH AND SPACE

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