[JRutledge]

I guess it depends on what you are looking for and what your level of experience is. Many of the books (which are not different from anything instructional) are very basic. I have in the past bought the Basketball Guidebook. This book has very good detail of signal mechanics and goes into detail about 2 Person mechanics. It is usually better for officials just starting out or for officials that do not have time to attend many camps. Unfortunately it does not deal enough with 3 Person and coverage areas and situations. You can buy the Center Official book that deals with more 3 Person mechanics and coverage areas. I just feel the book is not something an experienced official has not already heard before. But it is still a good reference tool so you can refer back to as a refresher. Everything I have perchance from NASO has value and helps me when I teach things to younger officials. I have been acted in some leadership roles and that is helpful to use in association meetings or hand out the information.

I would say buy something first. If you find value in the information, buy more stuff.

Peace