What follows is a list of sources I might recommend for a project researching how Aristotle and Saint Augustine defined happiness. This is not a complete list: we have thousands and thousands of books and articles covering all three. Instead, this is designed to give you an introduction to the kinds of tools that are available for most research projects at BC. I'll illustrate a few in a video.
The library catalog and most of our databases have a feature which will create an APA-formatted citation for you, but it's a good idea to check that against the rules for the style you're using. BC Libraries maintain a comprehensive guide to citing sources, linked below.
My contact information is to the right. I'm working remotely at the moment, so usually email or a phone call is a good idea to start. I'm available to meet online roughly 9-5 during the week, and if you click on Make An Appointment you can see my schedule and pick a time that works for you.
If I'm not handy, our Ask A Librarian service lets you ask a question by phone, email, or 24/7 online chat.
A few non-philosophy sources as examples of what sorts of other material is available. BC has over 800 specialty databases, and there are likely a dozen relevant ones for any given topic. Check the Database A-Z or ask for a recommendation.