The book is also accompanied by a case, which only adds to the value of the book. As a mounting type, Surface Mount is recommended for it. The BU7844 family of parts can be found by searching for a part number that is similar to it.
BU7844GU-E2 Features
BU7844GU-E2 Applications
There are a lot of ROHM Semiconductor BU7844GU-E2 Audio Special Purpose applications.