Pod Crashing Episode 81 with Eric Nuzum
The book is titled MAKE NOISE: A Creator's Guide to Podcasting and Great Audio Storytelling

It’s the first book on the craft of audio storytelling from a true podcasting pioneer. A veteran of NPR and Audible, Nuzum has created and produced podcasts that routinely top the charts, appear in yearly “best of” lists, and win awards. Of the six billion podcast downloads each year, more than one billion of those are for the 130 podcasts Nuzum created, including the TED Radio Hour, Invisibilia, Where Should We Begin? with Esther Perel, and The Butterfly Effect.