Transition words and phrases are one area where writers often get into ruts. But not with this this handy little reference: A Writer's Guide to Transitional Words and Expressions by Victor Pellegrino.
The book contains word lists based on the content of the transition, which, along with a thumb-tab page design, makes it easy to find an alternative phrasing.
If you often write articles or other materials that present quotes from sources, the book is worth the price just for its list of substitutes for the word "said."
Only a few books earn a spot on my desk because I use them every day. This book is one of them.
Pellegrino has published two other books that appear useful, although I haven't yet reviewed them: