A call number is the "address" of a book in the library. PC uses Library of Congress Call Numbers, which may be different from systems you've seen in other libraries. The locations all begin with a letter which represents the broad subject of the book, followed by numbers and other letters. Library staff can direct you to the location of the call number, then you can look for the letter and number on the spine of the book.
KF4528. C67 2004
You can discover and connect to ebooks through GIL-Find. Do a search, then in the left column under Format, select Electronic. You will need your PGSU credentials to read ebooks off campus.
By changing the drop-down to the right of the search box in GIL-FIND, you can search for books in the University System of Georgia.. This searches all the state college and university libraries such as Kennesaw and UGA. To request a book through the GIL Express request system, you must first be logged into "My Account." Books usually arrive within a week.
Find detailed directions at this link: http://answers.library.gsu.edu/faq/79015