Is it print?
Is it an electronic book?
Is it an electronic journal article?
Is it something your professor put on reserve?
Is it equipment, such as a projector?
The DOI, or Digital Object Identifier, can be a big help in locating an item. A DOI might look like this: 10.1007/s00436-016-5037-y If you know the DOI of your item, you can locate the article in two ways: