Resurse
- http://www.astronomy2009.org/
- http://www.astronomy.com/
- http://www.astronomy.ro/
- http://www.sprestele.ro/
- http://www.astro-info.ro/
- http://diglib.nso.edu/
- http://www.nightskiesnetwork.com/
- http://www.seds.org/messier/
- http://astrim.free.fr/
- http://www.heavens-above.com/detailform.asp/
- http://astro.nineplanets.org/bigeyes.html/
- http://astromagazin.ro/catalog/
- http://diglib.nso.edu/