PsycINFO is a database of journal literature covering psychology, mental health and allied topics. It is produced by the American Psychological Association, and indexes around 2,200 peer-reviewed journals, from over 50 countries. It also contains details of a number of books and dissertations. Journal coverage starts from 1887.
PsycINFO can be searched via the ProQuest interface, and you will need an NHS OpenAthens account.