These resources can help you come up with dates, names, additional vocabulary and variant spellings for your research. They can also help you develop a better understanding of your topic or give you ideas for comparisons and contrasts.
If you are finding your references to journal articles or books from other books and articles--look them up in Articles+ or the Franklin Catalog.
If you are searching databases, look for the 
icon:
When Searching Google Scholar, look for "full text via Penn Text" or click on the 
and look for "Penntext"
If the book or books you need are checked out or not on the shelf, request it through Borrow Direct or EZ borrow. Turn around time is less than a week. This is a good reason to get a head start on your research.
For individual appointments or questions by email contact Rebecca Stuhr stuhrreb @ upenn.edu
Rome. Baths of Caracalla. From the Collections
at the Library of Congress
Secondary sources may lead you to specific points within the ancient texts that support your argument. They also contain extensive bibliographies for additional secondary sources. Journal articles serve a similar purpose.
Ancient Rome: An Introdcutory History by 
Ushering in a New Republic: Theologies of Arrival at Rome in the First Century BCE by 
Making the Middle Republic: New Approaches to Rome and Italy, 400-200 B.C.E. by 
The Peace of the Gods: Elite Religious Practices in the Middle Roman Republic by 
The Functions and Use of Roman Coinage by 
Ancient Rome from Romulus to Justinian by 
Oxford Handbook of Greek and Roman Slaveries by 
Cicero: Politics and Persuasion in ancient Rome by 
Constructing Communities in the Late Roman Countryside by 
Emperor of Rome: Ruling the Ancient world by 