APA Style is the style guide of the American Psychological Association and is now in it's 7th edition. UCL Library holds the latest publication manual in print and as an e-textbook.
The APA website offers Instructional Aids and Tutorials and Webinars for anyone looking to improve their knowledge of APA Style.
An updated UCL Guide on using APA provides more detail.
Reference management software packages can help you:
There is a range of different software available; UCL Library Services provides support and guidance for Endnote, Zotero and Mendeley. These are all available to download for free or under UCL licences.