One book I recommend for all writers:

Spunk and Bite by Arthur Plotnik Plotnik is what all of us aspire to be. Vibrant, alive, experiencing, bold. This book will help you write as you should: fearlessly.

One book I recommend for all fiction writers:

Give ‘Em What They Want by Blythe Camenson and Marshall J. Cook I own this book and I used it for writing my proposal for Talking to the Dead. The writing is good. The examples included are excellent. Highly recommend this one.

One book I recommend for all non-fiction writers:

How to write a book proposal by Michael Larson This is the book I bought after I spoke to an editor about my non-fiction. Plain spoken, easy to understand, helpful, useful. Everything a book like this should be.