Cita APA

 Lewis, N. (2007).  Gold: The once and future money.  John Wiley.

Chicago Style Citation

 Lewis, Nathan.  Gold: The Once and Future Money.  John Wiley, 2007.

Cita MLA

 Lewis, Nathan.  Gold: The Once and Future Money.  John Wiley, 2007.

Atenció: Aquestes cites poden no estar 100% correctes.