Use economics databases and databases from other disciplines to find wide-ranging, relevant literature. Look for dissertations and theses on your topic and use their cited references.
Note the difference between peer-reviewed literature and working papers. Working papers are often timely and valid to use, but haven't gone through formal peer review. Anatomy of a Scholarly Article shows the typical sections of peer-reviewed literature.
Scopus is good for identifying and ranking key journals and highly-cited articles.