In my spare time, I love to read grammar books and dictionaries. What's that? No tittering!
In Bill Walsh's Lapsing Into a Comma: A Curmudgeon's Guide to the Many Things That Can Go Wrong in Print—and How to Avoid Them:
CLIFFS NOTES That's right, Cliffs Notes. I would have thought it was Cliff's Notes, and everyone else in the world somehow got the idea that it was Cliff Notes, as though writing a paper without them was like falling off a cliff.
So, being me, I looked it up. Per CliffsNotes' official site:
Call it a Cliff Note, Cliffs Note, or CliffsNotes, if you're looking for the original literature study guide series you can trust, then you've come to the right place. Find out more About CliffsNotes!
CliffsNotes, one word. Maybe I should write a book!