Here are a few books I would recommend to those looking to get published.
For those going the agent or traditionally published route, these are invaluable:
For those wondering how to tackle getting self-published and marketing yourself.
I would recommend signing up to David Gaughran's newsletters - plus you can get Amazon Decoded for FREE by doing so. (click on the image of the book to link to his site)
I would also recommend checking out Dave Chesson & his Kindlepreneur website
He provides a wealth of free information.
And if you want to understand what the whole ISBN thing is about, here's my post about it.
And if you are looking for help with writing content for your blogs, blurb or making your selling content sharper, the best free resource is: Copyblogger.
You can find an article I wrote about it here.
But this book on Blurbs is a must read for all self-published writers!
Books to help with the technical side of writing
The first three are for the grammatical side.
These are for structuring and outlining your book.