thecfawannabe

There is no book.

Schweser has a sheet of 4 pages that is like $30.

Stalla has Mnemonics that they introduce throughout the program in the lectures.

Both companies have formula lists in the back of their books. You can make up your own mnemonics or there are quite a few final prep threads on AF that discuss good tricks to remember the formulas. Definitely bump any good ones that you see so you can help out your AF peers. They are probably in the L1 topic forum rather than General Discussion.