It depends on which library the book is in. Most University of Toronto libraries have a separate reference area where they keep dictionaries, encyclopedias, and other reference books.
Ask for directions at the front desk of the library you're visiting.
In Robarts Library, reference books are currently in two temporary locations as follows:
A to Z1035 - 10th Floor (opposite elevators)Z1036 to ZA - 12th Floor (opposite elevators)
If the item you need is not found in one of these locations, please go to the call number location in the Stacks where older editions of each item may be found.
If you still can't find the book you need, please email email@example.com.