References
- http://www.space.com/15693-telescopes-beginners-telescope-reviews-buying-guide.html
- https://portal.utpa.edu/portal/page/portal/utpa_main/daa_home/cosm_home/physics_home/physics_files/astr1402-lab2i.pdf
- http://www.universetoday.com/24633/star-classification/
- http://www.eudesign.com/mnems/startemp.htm
- http://www.eudesign.com/mnems/startemp.htm
- http://en.wikipedia.org/wiki/Stellar_classification
- http://www.atlasoftheuniverse.com/startype.html
- http://en.wikipedia.org/wiki/Star
- http://www.astrophysical.org/starclassification.php
- http://astro.unl.edu/naap/hr/hr_background1.html
- http://www.ualberta.ca/~pogosyan/teaching/ASTRO_122/lect12/lecture12.html
- http://lcogt.net/spacebook/types-stars
- http://aspire.cosmic-ray.org/Labs/StarLife/hr_diagram.html
- http://hubpages.com/hub/Different-Types-of-Stars-in-the-Universe
- http://space.about.com/od/stars/tp/What-Are-The-Different-Types-Of-Stars.htm
- http://www.bubblews.com/news/704487-fun-trivia-about-stars-part-1
- http://www.sciensational.com/astronomy.html
- http://www.usd281.com/stars/Trivia%20(Right%20Frame).html
- http://en.wikipedia.org/wiki/Star_catalogue
- https://www.google.com.ph/search?q=henry+draper+catalogue&biw=1366&bih=677&source=lnms&tbm=isch&sa=X&ei=zSrjVPvrPOfGmAXyl4KICg&ved=0CAYQ_AUoAQ&dpr=1#imgdii=_&imgrc=agJtFoagmHEYxM%253A%3BSl_1EY5E5KLUqM%3Bhttp%253A%252F%252Fimages.betterworldbooks.com%252F114%252FThe-Henry-Draper-Catalog-Volume-94-9781142370909.jpg%3Bhttp%253A%252F%252Fwww.quazoo.com%252Fq%252FHenry_Draper_Catalogue%3B308%3B400
- http://www.space.com/21719-vega.html
- http://www.space.com/22842-arcturus.html
- http://www.space.com/23563-rigil-kentaurus.html
- http://www.space.com/22858-canopus.html
- http://www.space.com/21702-sirius-brightest-star.html