The On Writing Well book is available in pdf for free download from this page. “On Writing Well” is one of the best known nonfiction writing manuals of William Zinsser. The book originated from a course that the author, Zinsser offered at Yale; it is characterized by commonsense advice, simple and informal style. After going through the literature and using this tool I recommend it for anyone who would wish to have better grammar in their writing being it for business or personal use. Published for the thirtieth time, the book remains one of the most valuable guides to the art of non-fiction.