Here are some homebrewing books that have been instrumental in helping me become a confident enough brewer to successfully deviate from recipes, and get creative with new additions.
For new homebrewers
Charlie Papazian’s The Complete Joy of Homebrewing is a must-read primer. In simple to understand language, Papazian walks you through the entire process of homebrewing, and gives you a solid foundation for brewing. There are also quite a few recipes included that are quite creative with additions.
How to Brew: Everything You Need To Know To Brew Beer Right The First Time by John Palmer was also instrumental in my learning to homebrew. Palmer goes a bit more in to depth on the scientific reasonings behind things homebrewers do, and I still find myself reviewing things from this book.
Solid starter recipes
Brewing Classic Styles: 80 Winning Recipes Anyone Can Brew by Jamil Zainasheff and John Palmer has become my goto place for recipes I can trust. If I make a recipe from this book, and it doesn’t turn out well, I know I have no one to blame but myself. Each recipe will provide a solid base for whatever addition you want to add.
Designing your own recipes
Designing Great Beers: The Ultimate Guide to Brewing Classic Beer Styles by Ray Daniels breaks down many styles, and using winning homebrew recipes, looks at what ingredients are needed to make a great beer. This book is definitely useful when designing your own recipe from the ground up.