Query Perfection: Your Guide to Query Perfection, How to Write a Query Letter, Catch an Agent's Eye, Master the Art of the Query: Query Perfection, Mind Blowing Guide
I am a writer. I would like to make a profit off this, who wouldn't? But even if I didn't the fact that people can view my words makes me a happy camper. Writing calms me and helps me meditate. Whatever I write I hope it is good and among deserving eyes.
This is a great book, if you aren't sure how to write a Query letter and gives great advice on how long to wait after sending it. It also gives good examples to help you write it. It talks about how to write blurbs as well.