1. Allen, Jesse S., "High Energy Astrophysics: Brief History." http://heasarc.gsfc.nasa.gov/docs/heasarc/headates/heahistory.html (May 2, 1996).

2. Allen, Jesse S., "Images from the Small Astronomy Satellites." http://heasarc.gsfc.nasa.gov/Images/pretty_pictures_sas.html (May 2, 1996).

3. Culhane, J. Leonard and Sanford, Peter W., X-ray Astronomy (Charles Scribners's Sons, New York, 1981).

4. Giacconi, Riccardo and Gursky, Herbert, X-ray Astronomy (D. Reidel Publishing Company, Boston, 1974).

5. National Air and Space Museum, "Stars (Gallery 111)" http://www.nasm.edu/GALLERIES/GAL111/gal111.html#uhuru (April 10, 1995).

6. Patricia Pengra, "ROSTAT Brochure." http://spacelink.msfc.nasa.gov/NASA.Projects/Space.Observatories/Roentgen.Satellite.ROSAT/ROSAT.Brochure.Text.Only (September 5, 1996).

7. Tucker, Wallace and Giacconi, Riccardo, The X-Ray Universe (Harvard University Press, Cambridge, Massachusetts, 1985).

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