Looking for books (in english) that are totally about spool knitting is not easy, but I have found the two below on eBay.
The first book "Corking" was published in 1998 by Judy Ann Sadler.
This book has patterns for toys, puppets, dolls' clothes, clothing, hair accessories, etc.
The first book "Corking" was published in 1998 by Judy Ann Sadler.

Below is the book - "Knitting Knobby Hobby" a publication by C J Bates & Son in 1978.

If you are a doll lover/collector, below we have the book "Spool Knitting Treasures: Small Dolls & Pocket Pals" by Noreen Crone-Findlay c2002. This book is available directly from www.crone-findlay.com.



You can follow specific patterns or you can get a lot of ideas from patterns, and take those further.
For knitters, these cords would make great trims for your caps, tops, bags, and cardigans, etc., and don't forget that you can use wools or cottons. A growing fashion at present is making your own jewellery with a spool knitter and you can include beads, sequins and other embellishments.
Have fun with your spooling!