Perfect Requirements Bible
This book is being used by my company as the Requirements Bible and it's working really well for us. I highly recommend it. Well-written, easy to read, easy to use, and has great examples.
I'm a 20+ year veteran IT professional who finds it hard to keep up with all the latest trends. I just didn't know which book to reach for. This book helped me catch up on a few things. I haven't had a class in business analysis in at least a decade if not more, so if you are in the same boat, you need this book.
If you are relatively new to the field, this book will give you great templates and give the quality of your documentation a huge boost.