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.
An updated UCL Guide on using APA will be available for the start of the 2021/22 academic year.
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.