APA Citation

 Radcliffe, D. (2003).  Halo: Combat evolved.  Sybex.

Chicago Style Citation

 Radcliffe, Doug.  Halo: Combat Evolved.  Sybex, 2003.

MLA Citation

 Radcliffe, Doug.  Halo: Combat Evolved.  Sybex, 2003.

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