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

by Pat Flynn
I’m very excited to introduce you to another SPI listener success story. Here with me this week is Robert Duff, Ph.D., a psychologist who’s supplementing his income by selling his books on Amazon. Robert is devoted to his work as a psychologist and therapist. Thanks to his online book and audiobook sales, he no longer has to approach that work from a place of financial need—h ...Read the full article