Citation Management Systems help you keep track of your sources, easily organize and annotate sources, and assist with citations.
A Source Matrix (also sometimes called a Data Extraction Form) can be a useful supplemental tool to help you put all the articles you plan to use to inform your work into one place. Here you can organize main takeaways from the articles and your thoughts on them to start to structure a skeleton outline of your literature review.
For additional help, here are additional resources at JMU and on the web that address APA Style and citations