Integrated Business Foundations Writing Resources
Sources to Help You Format and Write Professionally
Sections from Purdue OWL:
Effective Workplace Writing (four sections).
Prioritizing Your Concerns for Effective Business Writing (higher order and lower order).
HATS: A Design Procedure for Routine Business Documents.
Writing the Basic Business Letter.
How to Write a Business Memo (five sections starting here).
Other Source:
Integrated Business Blog 