Books (and ebooks) are excellent sources of information. They will help you gain a better understanding of a topic and should be among the resources used to complete your coursework. Here are a few characteristics of books:
Library books are arranged by "classification systems". Depending on the library, a book will typically be classified using the Dewey Decimal Classification System or the Library of Congress Classification System. While these classification systems differ numerically, they have one important thing in common - both systems assign "call numbers" based on the subject of a book. That means that books on the same subject are generally located next to each other on a library shelf.
To find a book in your school's library, first find the call number in the TOPCAT record.
Now, use that call number to find the book in the stacks of your library. The call number is located on the book's spine. Remember, library books are arranged by subject. That means if you find one book on a topic, you may find more by browsing the other titles on the shelf.
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"How to Read a Library of Congress Call Number", University of Arkansas Libraries: https://libraries.uark.edu/
"Call Number 101", Cardinal Léger Library: https://www3.dpcdsb.org/LEGER/learning/library