Use each database separately. If you don’t, you won’t get all the books from PsycInfo. Each database has slightly different limiters
Use full text, date and peer review limiters
Check any specific Source Type (articles, books, etc)
Choose drop-down lists for Publication (you can choose specific journals) Classification and Methodology (“empirical study”) to find other useful ways to narrow your search
PsycArticles is scholarly articles only
PsycINFO has books, dissertations, etc