This book by Roger Brauer is a comprehensive resource that covers a wide variety of topics. I purchased this book to study for the ASP and CSP certifications. I decided to keep the book after I passed both exams since it was such a great resource.
Similar to the book above, this book written by Robert H Friis is another comprehensive safety resource.
This study guide series published by Mometrix is a great resource for any of the BCSP certifications. While it is not as comprehensive as some of the other study guides on the market, these books are far less expensive. I used the CHST study guide book when I earned the CHST designation.
This book by Debra Nims covers many of the vital safety topics for professionals who need to have an understanding of industrial hygiene information. I used this book in college and I found it very easy to follow along. It is a great book to refer back to when needed.