Following up again as I just came upon a new resource that I am going to use in my AP Psychology Course at Athena's (hope I am allowed to mention that)http://sciencecases.lib.buffalo.edu/cs/collection/?fbclid=IwAR2m-csnLO0ErgWhKBN_uPaMEkFKGYHuAVG66apkCPJgK8sIo47vv-tYBvg . Type psychology into the keyword search and you can even select the level. It looks to be an awesome resource. Hope this helps! Take care🙂

I just re-read what I wrote before I fell asleep😴 Yes, I definitely agree there is primary research that would be suitable for sure, but it will take a bit of effort to find it and it will probably not be the most enjoyable way to start off in the field for most kids. Although as a parent of a PG kid, I know what interests him is often quite unusual! I used to teach Intro Psych at the undergraduate level (mostly freshman and sophomores) and it was very challenging for most of the students to really digest the primary articles that I used that were very simplistic, so I would limit requirements to one to two articles . However it is very important to get used to reading the primary research, so I definitely hope I didn't seem to suggest otherwise. I would be sure to find highly interesting options that won't bog the reader down in complex methods and statistics - unless they have background in that area 🙂 The Hock book is a good way to get introduced to the important historical research in the field. Each study is summarized in detail in the same sections that are usually seen in the primary research - Intro, Theoretical Considerations, Methods, Results, Discussion/Significance of Findings.

Try the book 40 Studies that Changed Psychology by Roger Hock. It will give her very good background about the research that has shaped the field of psychology. I am a psychologist and now a homeschooling parent who teaches online high school psychology classes. Peer-reviewed articles will likely be rather challenging to start with, even for a very advanced 13-year-old.