SuperSearch is a great place to start for journal articles, books and almost everything else the library has, in one easy to use interface.
For searching with more focus and precision, try one of the databases recommended on this guide.
Peer-reviewed articles are easily found in SuperSearch; there is a filter button directly under the search box on the results page.

Peer reviewed articles and book reviews of world history (excluding the US and Canada), 1450 CE to present and searchable by historical time period.
To maximize the power of this database, limit your results by historical period in the advanced search page:

Peer-reviewed articles, scholarly books, and academic theses published from 1859 to present on all aspects of medieval and Renaissance life (400 CE to 1700 CE).
Dates: 1859 CE-Present
Scholarly articles, books, and book reviews on all aspects of Ancient Greek and Roman civilization, including Greek and Latin literature and linguistics (including early Christian texts), Greek and Roman history, art, archaeology, philosophy, religion, mythology, music, science, and related areas.
L'Année Philologique allows only 2 users at a time. Please close your browser tab/window when you are finished.
Full-text peer-reviewed articles on gender, sex, and sexuality in history, sociology, psychology, education, art, and more.
Full text of core British primary and secondary sources for medieval to modern history (with primary focus on 13001800 CE). Primary sources focus on government records and include parliamentary records, land transfers, privy council papers, and more.
Dates: 11th Century CE - 20th Century CE
Citations to journal articles, book chapters, books, and dissertations from the international scholarly literature of psychology and psychological aspects of related disciplines. Access to a thesaurus of psychological terms.
Peer reviewed articles and books on all aspects of philosophy.