เนบิวลาวงแหวน (Thai Wikipedia)

Analysis of information sources in references of the Wikipedia article "เนบิวลาวงแหวน" in Thai language version.

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books.google.com

Coe, Steven R. (2007). Nebulae and how to observe them. Astronomers' observing guides. Springer. p. 111. ISBN 1-84628-482-1{{cite book}}: CS1 maint: postscript (ลิงก์)

Harris, Hugh C.; Dahn, Conard C.; Canzian, Blaise; Guetter, Harry H.; Leggett, S. K.; Levine, Stephen E.; et al. (2007). "Trigonometric Parallaxes of Central Stars of Planetary Nebulae". Astronomical Journal. 133 (2): 631–638. arXiv:astro-ph/0611543Freely accessible. http://adsabs.harvard.edu/abs/2007AJ....133..631H
O'Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (2002). "Knots in Nearby Planetary Nebulae". Astronomical Journal. 123 (6): 3329–3347. http://adsabs.harvard.edu/abs/2002AJ....123.3329O

"Messier 57 - The Ring Nebula". Universe Today (ภาษาอังกฤษแบบอเมริกัน). 2017-09-25.