Remembering Reference Books

Sometimes students have a hard time remembering the purpose of each type of reference book.
A "trick" that might be helpful to them is this:

Dictionary---Defines
Thesaraus---The same
Encyclopedia---Explains
Atlas---Where it's At
Almanac---All the facts

Unfortunately, I don't remember where or from whom I got this so that I can give credit where it's due. : (

Happy Reading,

Michelle