SPI 206: How SPI Reader Robert Duff Is Building Passive Income with Books on Amazon

The Smart Passive Income Online Business and Blogging Podcast ›

37:35 | Mar 23rd, 2016

#206: Here with me this week is Robert Duff, Ph.D., a psychologist who's supplementing his income by selling his books on Amazon. We discuss how to create and sell books for print, digital, and audio....Show More