This is a free textbook offered by BookBoon.
'THE SMART GUIDE TO BUSINESS WRITING is a hands-on, easy guide to writing all the different business materials that may be required in the course of a career. You will find tips on writing everything from business emails to power points to performance reviews to sales reports to business letters (yes, they still exist). The book is a quick and simplified guide to writing business materials you can be proud of, business writing where you will shine. There’s even a bit of humour along the way.'