Essays / Proper way to insert images into college-level paper [4]

What is the proper way to insert images into a college-level paper? The paper is an evaluation of different ads found in newspapers, and the ads must be included (digitally) into the document. Should these be in-line (within the text of the document) or appended to the end of the document in a special section.

Exact Instructions:Include ads that target various social classes rather than choosing ads that all target the same social class. Attach a copy of each ad to the report.

I cannot find any online (or offline) source for this information. It is likely that I am just not entering the proper search query. If you are aware of the proper methodology, can you please point me to an online resource that discusses this topic?

Thanks in advance,
Matt