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

insulin resistance, diabetes, blood sugar, weight loss

#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. Podcast show notes available here: 

See Privacy Policy at and California Privacy Notice at .

Cameron Long
 

>