How to Write Clearly
How to Write Clearly: Write with purpose, reach your reader and make your meaning crystal clear (Freelance Writing Essentials) eBook : Albrighton, Tom, Kessler, Doug: Amazon.co.uk: Kindle Store
The Complete Plain Words a book by Ernest Gowers
Plain Words is one of the earliest and most influential books on the subject of clear language. First published in 1948, some of it is now dated and – as you might guess – there's no mention of the good ol' internet. But it's still a great read and worthy of a place on your bookshelves.