APA Citation

 Arny, T. (2008).  Explorations: An introduction to astronomy.  McGraw-Hill.

Chicago Style Citation

 Arny, Thomas.  Explorations: An Introduction to Astronomy.  McGraw-Hill, 2008.

MLA Citation

 Arny, Thomas.  Explorations: An Introduction to Astronomy.  McGraw-Hill, 2008.

Warning: These citations may not always be 100% accurate.