I initially bought this back in 2011 thinking I was going to need it for some college courses. Turns out I didn't.
But, as a "writer", I found it to be quite the indispensable tool and still use it as of today. I keep it on my bookshelf right by me. It's great for bloggers, writers, and students.
The "tabs" provide easy access for the sections you might need: composing/reviewing; academic writing; sentence style; word choice; word choice; grammatical sentences; ESL challenges; punctuation; mechanics; research; MLA (Modern Language Association) citations; APA/CMS (American Psychological Association)/(Chicago Manual of Style) citations; and basic grammar.
It can function not only as a textbook of sorts as well as reference for any kind of writing: creative, letters, blogs, or academic papers.
This is one of the rare reference novels I take with me on vacations in case I want to do some writing.
Of course, I should probably get a more recent version, this book is still in great shape.