References and Bibliography
- Burnham, Robert Jr.  Burnham's Celestial Handbook: An
Observer's Guide to the Universe Beyond the Solar System.  In 
three volumes.  Mineola, NY:  Dover, 1978.
 - Ferrarese, Laura; Freedman, Wendy L.; Hill, Robert J.; Saha, Abhijit;
Madore, Barry F.; Kennicutt, Robert C., Jr.; Stetson, Peter B.; Ford,
Holland C.; Graham, John A.; Hoessel, John G.; Han, Mingsheng; Huchra,
John; Hughes, Shaun M.; Illingworth, Garth D.; Kelson, Daniel; Mould,
Jeremy R.; Phelps, Randy; Silbermann, N. A.; Sakai, Shoko; Turner,
Anne; Harding, Paul; Bresolin, Fabio, The Extragalactic Distance
Scale Key Project. IV.  The Discovery of Cepheids and a New Distance
to M100 Using the Hubble Space Telescope, The Astrophysical
Journal, volume 464, page 568 (1996).
 - Freedman, Wendy L.; Madore, Barry F.; Mould, Jeremy R.; Hill,
Robert; Ferrarese, Laura; Kennicutt, Robert C. Jr.; Saha, Abhijit;
Stetson, Peter B.; Graham, John A.; Ford, Holland; Hoessel, John G.;
Huchra, John; Hughes, Shaun M.; Illingworth, Garth D., Distance to
the Virgo cluster galaxy M 100 from Hubble Space Telescope
observations of Cepheids, Nature, volume 371, page 757
(1994).
 - Halliday, David, Robert Resnick and Jearl Walker. Fundamentals
of Physics, Fourth Edition, Extended, with Modern Physics.  New
York: Wiley, 1993.  
 - Halliday, David and Robert Resnick. Fundamentals
of Physics, Second Edition, Extended, Revised Printing.  New
York: Wiley, 1986.  
 - Huchra, J.P. et al. (1995).  Reference listed as
"manuscript in preparation" in Ferrarese et al. (1996).  
 
 - Kaufmann, William J. Universe, Fourth Edition.  New York,
NY:  Freeman, 1994.
 - Seeds, Michael A. Foundations of Astronomy, Fourth Edition.
Belmont, CA: Wadsworth, 1997.
 
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