Jack Schafer

The Truth Detector : An Ex-FBI Agent's Guide for Getting People to Reveal the Truth

Jack Schafer

The Truth Detector : An Ex-FBI Agent's Guide for Getting People to Reveal the Truth

Jack Schafer, Marvin Karlins

The Like Switch: An Ex-FBI Agent's Guide to Influencing, Attracting, and Winning People Over

Jack Schafer, Marvin Karlins