It's been awhile, and I can't remember the book I used in college. But I've heard good things about Harvard Business Review's business communication textbook.
After that, I'd suggest looking at what business colleges and universities use for their coursework. At the higher levels, there's a special language and culture to business communications that's used to identify the "in" people and the "out" people. The elite universities teach this, of course.
https://www.amazon.com/Business-Communication-Harvard-Essent...
After that, I'd suggest looking at what business colleges and universities use for their coursework. At the higher levels, there's a special language and culture to business communications that's used to identify the "in" people and the "out" people. The elite universities teach this, of course.