APA Style "provides a foundation for effective scholarly communication because it helps writers present their ideas in a clear, precise, and inclusive manner.”
- American Psychological Association
The official APA Style Website has lots of useful information and examples.
The APA Style Blog is also a great source of information.
From the UTHSCSA library:
Zotero is an application that collects, managers, and cites research sources. It works in any OS, connects with your browser, and is free to use.
You can attach PDFs, notes, and images to your citations, organize them into collections for different projects, and create bibliographies.