Gyűrűs-köd (Hungarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Gyűrűs-köd" in Hungarian language version.

refsWebsite

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1books.google.com

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archive.org

Crossen, Craig, Rhemann, Gerald. Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer (2004). ISBN 3-211-00851-9. OCLC 52424007

books.google.com

Observing and Cataloguing Nebulae and Star Clusters: From Herschel to Dreyer's New General Catalogue. Cambridge University Press, 42–43. o. (2010). ISBN 0-521-19267-6

worldcat.org

Crossen, Craig, Rhemann, Gerald. Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer (2004). ISBN 3-211-00851-9. OCLC 52424007