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An Introduction to Modern Astrophysics, Carroll and Ostlie, copyright 2007.

Measuring the Universe The Cosmological Distance Ladder, Stephen Webb, copyright 2001.

Pasachoff, JM & Filippenko, AV, The Cosmos: Astronomy in the New Millennium, Cambridge: Cambridge University Press, 4th edition, 2013 .

The Astrophysical Journal, The Globular Cluster Luminosity Function as a Distance Indicator: Dynamical Effects, Ostriker and Gnedin, May 5, 1997.

An Introduction to Distance Measurement in Astronomy, Richard de Grijs, Chichester: John Wiley & Sons, 2011, .