A primary source is anything created during the period under study, and often the creator doesn't think of the material as a "primary source" when making it. An episode of The Simpsons is a great primary source when studying 1990s popular culture, but the creators did not have future historians in mind when creating the episodes. Examples of primary sources include:
Everything from scraps of ancient Egyptian papyrus to modern comic books are used as primary sources -- you're only limited by your creativity and ability to convincingly argue a thesis.
Topic: Second battle of El Alamein
Details:
What types of primary sources would this generate?
Databases: