Developed by HKU students, Weava is a free productivity tool available as a browser extension and an iOS mobile application that supports students in their research and writing endeavours. Weava allows users to highlight information directly on websites and PDFs, annotate said highlights, organize research in folders, and collaborate with others.
You can download it freely at: https://www.weavatools.com/
The AMA Style Guide for Business Writing
MLA handbook
Publication Manual of the American Psychological Association