Bibliografía

BRÜCK, M. T., Exercises in Practical Astronomy using Photographs, Adam Higler, 1990, p. 48.

GALADÍ-JORDÍ GUTIÉRREZ, David, Astronomía General, ediciones Omega, Barcelona 2001, p. 756

GNEDIN, O.Y., The mass profile of the Galaxy to 80 Kpc, The Astrophysical Journal, 2010, p. 720.

HENZEL, Donald H. / PASACHOFF, Jay M., Guía de Campo de las Estrellas y los Planetas de los Hemisferios Norte y Sur, Ediciones Omega, 1990, Barcelona.

HARRIS, William. E., 1996, AJ, 1487. 1996 (edición de 2010), p. 112.

KAUFMANN, William J., Universe, editorial Freeman and Company, New York 1996, 4th edition, p. 465.

LONGAIR, Malcom S., La evolución de nuestro Universo, Cambridge University Press, Madrid 1998, p. 7.

MARKS, Michael / KROUPA, Pavel, "Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way", Monthly Notices of the Royal Astronomical Society, (August 2010), p. 406.

MCMILLAN, P. J. (July 2011). Mass models of the Milky Way, Monthly Notices of the Royal Astronomical Society, p.414

RIDPATH, Ian/ TIRION, Wil, Guía de las Estrellas y los Planetas de los Hemisferios Norte y Sur, Ediciones Omega, Barcelona, 1986, p. 278.

VILLARD, Ray, “The Milky Way Contains at Least 100 Billion Planets According to Survey”, (11 de Enero, 2012), URL: http://hubblesite.org/

WEBB, Jeremy J., The Observational and Theoretical Tidal Radii of Globular Clusters in M87, (2011). Open Access Dissertations and Theses. Papel 5892. P. 27.

Skinakas Astronomy, Astronomy Project for University Students, Project 5, Globular Cluster pg. 7.

Wikipedia, cúmulos globulares, diversos autores, f. de consulta: 1-02-2013. URL: <http://en.wikipedia.org/wiki/Globular_cluster#cite_ref-1>

Space.com, diversos autores, f. de consulta: 12/01/2013, URL: <http://www.space.com/19157-billions-earth-size-alien-planets-aas221.html>

Asociación Astronómica de Sabadell, Cúmulos Globulares, diversos autores, f. consulta: 2/02/2013, URL: <http://multimedia.astrosabadell.org/main.php?g2_itemId=5806&g2_enterAlbum=0>

Astronomical Images, Star Clusters, old and new, diversos autores, f. de consulta: 2/02/2013, URL:< http://www.aao.gov.au/images/general/clusters.html>