The easiest way to bring together references from all sources is to use bibliographic reference managing software. Some of the apps with free versions include Zotero, EndNote Basic and Mendeley. Trinity has a subscription to a more powerful version of EndNote than the free app.
These apps allow you to import records from multiple databases, library catalogues and to also manually enter citations, and save them as a database in one location. They can then put the citations into your document, in a reference style you specify.
The Library runs classes on using EndNote throughout the year. We support two versions - EndNote Online and EndNote Desktop.