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Even the most seasoned researchers get stuck. That is part of the discovery process of research.
A few suggestions:
Change things up: try a different kind of database, change your keywords, try a citation chase
Talk to your professor or TA: they are researchers and can help direct you
Email or make an appointment with a subject librarian. You can email Dot Porter (firstname.lastname@example.org) and she will help you find the librarian who can be most helpful to you.
What do I do if I hit a paywall?
Using Penn subscribed databases sends you through the Libraries "proxy." The proxy is the key that unlocks the subscription paywalls. You should never have to pay for a journal article. Talk to your librarian if you run into trouble connecting to an article. 99% of the time they can help you get the article quickly.
To avoid paywalls:
Connect to databases through library guides like this one or through Franklin Catalog.
Use Google Scholar Advanced settings to recognize your Penn affiliation.
Click the three short lines or "hamburger' in the right hand corner
Click settings > library links > Search for University of Pennsylvania in the search box > check University of Pennsylvania - Full Text via Penn Text > save
If we don't have direct access to an article or book chapter, you can "Request Scan" (the Libraries will request from another library--turn around time can be quick!) or request books from "Request Print," which will trigger a request from one of our partner libraries. Log into Franklin Catalog to see all of your options.