Presenting Data Graphically and Presenting Results
Improving Data Visualisation for the Public Sector supports public sector researchers improve the way that they visualise data, by providing good practice examples and case studies, practical and step-by-step guides on how to visualise data, and links to more detailed resources.
Plain Language.gov from the US Govt, especially see the guidelines with sections like short sections, useful headings, etc.
How to Write a Scholarly Research Report by Rudner, Lawrence M. & William D. Schafer (1999) in Practical Assessment, Research & Evaluation, 6(13). Brief introduction and descriptions of sections in a report.