Citazione APA

 O''Bryan, P. (2007).  Your portable empire: How to make money anywhere while doing what you love.  John Wiley & Sons, Inc.

Stile di citazione Chicago

 O''Bryan, Pat.  Your Portable Empire: How to Make Money Anywhere While Doing What You Love.  John Wiley & Sons, Inc, 2007.

Citazione MLA

 O''Bryan, Pat.  Your Portable Empire: How to Make Money Anywhere While Doing What You Love.  John Wiley & Sons, Inc, 2007.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.