What are the best books for ACT prep?

The following three books are the same books I use with all my one-on-one ACT students, and which are recommended for use with Green Test Prep. They contain the best practice tests, practice problems, and instruction, and I view them as indispensable to a good ACT prep program:
The Real ACT – 3rd Edition
McGraw Hill’s 10 Practice ACT Tests
1,296 ACT Practice Questions – 3rd Edition