Administrative Assistant's and Secretary's Handbook (e-bok) by 
The AMA Handbook of Business Writing by Find books by searching CAMEO, the library catalog. Use related keywords (as in "Articles to the right) or these specific subject headings:
Some examples:
Workplace Communication for the 21st Century by 
Harvard Business Review on Effective Communication
The Official Book of Electronic Etiquette by Use keywords such as: communication, writing, style, public speaking, technical writing, etiquette, presentations, correspondence, etc.
