Klasyfikacja galaktyk Hubble’a (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Klasyfikacja galaktyk Hubble’a" in Polish language version.

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archive.org

ia802600.us.archive.org

E.P. Hubble: The Realm of the Nebulae. New Haven: Yale University Press, 1936. ISBN 0-300-02500-9. (ang.).

harvard.edu

adsabs.harvard.edu

E.P. Hubble. Extra-galactic nebulae. „Astrophysical Journal”. 64, s. 321–369, 1926. Bibcode: 1926ApJ....64..321H. (ang.).

phys.org

Astronomers show galaxies had ‘mature’ shapes 11.5 billion years ago. Phys.org, 2013-08-15. (ang.).