https://www.amazon.com/Effective-Communication-Skills-audiobook/dp/B00DTNWN0A
I google'd "effective communication skills audible" as he said it was a course on Audible. Can't confirm if this is the one he was talking about.
I think it's: https://www.amazon.com/dp/0062390856/ref=cm_sw_r_cp_apa_i_aYggFbAZQ7X9B
Everybody Lies
but I'm not sure.
I've heard other people really about this book in that context, and I should probably check it out.