In addition to the location, you will need to know the book's call number, which will lead you to where the book sits on the shelf. The Library's collection is arranged by Library of Congress Classification and the call number will be a combination of letters and numbers.
In the JETfind, this book appears as: Persepolis by Marjane Satrapi
The location and call number is listed as the Circulating Collection: PN6747.S245 P4713 2003
Read call numbers left to right grouping letters and numbers together or, on a book's spine label, line by line.
Looking at PN6747.S245 P4713 2003
To find this book on the shelf:
The image below offers a different example, using the spine label set up and the call number LB2395.C65 1991
If you can't find a book where you think it should be, ask a librarian for help.