You'd be better off with general academic articles or even just the Wikipedia for it if you don't know anything about oxytocin yet
But here you go:
https://psycnet.apa.org/record/2020-48708-003
https://pubmed.ncbi.nlm.nih.gov/22281209/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3183515/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8009111/
Unless you have a background in medicine/psychology it'll probably be over your head. But if your familiar with any type of research you can probably manage.
I'd start with something this tho