The book is Painless Paper Piecing by Marjorie Rhines, is all about the folded technique and was highly recommended to me -- because as I say, paper piecing is not part of my strong skill set.
Here's an amazon link -- although there is an expensive copy, there are also more affordable options.
https://www.amazon.com/dp/0971450110/ref=sr_aod_dp_img
The pattern itself is Su-Lin (Panda Bear) and I haven't found a very good picture yet, get a file not find error...you get a suggestion that the book is out of print and maybe you can find it on amazon! Here's the not very good picture that leads to the file not found link.
https://www.quiltdesignnw.com/ppp-gallery.htm