Business Communication
http://www.businesscommunication.org/- Association for Business Communication- Includes background, membership information, publication and convention details, jobs list, and members-only section.
https://hbr.org/2014/11/how-to-improve-your-business-writing- Harvard Business Review- How to Improve your Business Writing
Communication
https://www.natcom.org/- National Communication Association
https://www.iabc.com/- International Association of Business Communcators
Non-Verbal Communication
https://www.andrews.edu/~tidwell/bsad560/NonVerbal.html- Andrews Universtiy- Non-Verbal Communication Modes and Cultural Differences
http://www.forbes.com/forbes/welcome/- Forbes- 10 Nonverbal Cues That Convey Confidence At Work