Tracing Cited References
Use the following databases to find a relevant resource and then see which later texts cite the one with which you start. Keep in mind, however, that the citations will no be comprehensive—i.e., the citations will often be limited by the scope of the database in which you're working.
Database searching for experienced researchers
If you've been using advanced search techniques like phrase searching and you're not finding enough sources that are on-topic, take a look at this quick slideshow.