APA Citation

 Bardi, J. S. (2009).  The fifth postulate: How unraveling a two-thousand-year-old mystery unraveled the universe.  John Wiley & Sons.

Chicago Style Citation

 Bardi, Jason Socrates.  The Fifth Postulate: How Unraveling a Two-thousand-year-old Mystery Unraveled the Universe.  John Wiley & Sons, 2009.

MLA Citation

 Bardi, Jason Socrates.  The Fifth Postulate: How Unraveling a Two-thousand-year-old Mystery Unraveled the Universe.  John Wiley & Sons, 2009.

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