Instructors make some books available at the library for students in their courses and these books are considered to be "on reserve". 

You can  search on the Course Reserves page here: https://keyanolibrary.on.worldcat.org/courseReserves/landing or you can ask library staff for the title you need. 

All "Reserves" collection items are shelved behind the Library Service Desk.

Please be aware that these items have different borrowing limitations, so you may not be able to remove the book from the library.