Print Reference books are found in the Reference Room (also known as the Quiet Study Area) on the Whittemore Library's first floor.
After you enter the building, turn left, and walk all the way down and you'll see the Reference Room next to the Reference Desk and the two print stations.
Sample Print Reference Books:
Legal Research: How to Find and Understand the Law by 
Legal Research in a Nutshell by AHA Guide to the Health Care Field