nomical Association. 108 (2): 79–89. Bibcode:1998JBAA..108...79R.Russell, Henry Norris (October 1922). "The new international symbols for the constellations". Popular Astronomy. 30: 469. Bibcode:1922PA.....30..469R. {{cite journal}}: Invalid |ref=harv (help)Sherrod, P. Clay; Koed, Thomas L. (2003). A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations. Dover Publications. ISBN 978-0-486-42820-8. {{cite book}}: Invalid |ref=harv (help)"Hubble Essentials: About Edwin Hubble". HubbleSite. Space Telescope Science Institute. 2008. සම්ප්‍රවේශය 29 April 2012.Staal, Julius D.W. (1988). The New Patterns in the Sky: Myths and Legends of the Stars (2nd ed.). The McDonald and Woodward Publishing Company. ISBN 978-0-939923-04-5. {{cite book}}: Invalid |ref=harv (help)Thompson, Robert Bruce; Thompson, Barbara Fritchman (2007). Illustrated Guide to Astronomical Wonders. O'Reilly Media. ISBN 978-0-596-52685-6. {{cite book}}: Invalid |ref=harv (help)Wagman, Mo