I'm in South Korea, and I need a book for a group that I teach. I would prefer one or two books to cover these topics:

- Business Presentations
- Business Conversation
- Business E-mail
- Phone conversation
- Resumes
- Persuasion

There are a lot of books out there, and I don't have a lot of time to choose. If anyone has working with a book that they found to be clear, uncomplicated, and with good activities, please let me know!

Thanks very much!