This book is published by Clover Japan. Only sold at craft store.(no ISBN listed)

The basic technique is available at You Tube (explained only in Japanese).

This is very unique that this patten is combination of crochet and Tunisian crochet. First, flower part(the round shape) is crocheted and then the Tunisian part (the square part) comes after.

You do not have to buy Tunisian hook. This is made only by regular crochet hook.