He’s a never-ending source of new material, and Justin Bieber is gearing up for the September launch of his new book “Justin Bieber: Just Getting Started.”

The “One Less Lonely Girl” singer’s upcoming book chronicles his most recent tour and the making of the “Never Say Never” film.

And if “Just Getting Started” is anything like his first book “First Step 2 Forever: My Story” sales-wise (over one million sold), Justin will have another goldmine on his hands.

As for Bieber’s upcoming album Believe, Justin’s vocal coach Kuk Harrell told press, “The only conversation we’ve had about Justin’s album that we’re about to do is it’s really important that it’s the proper transition, because we’ve seen him [with] ‘Baby,’ now we’re watching him grow up. And we can’t just throw him into the adult game right away. It has to be the proper transition. There’s a record in between.”