Complimentary PDFs of Intro and a Chapter from 7 of Tom's books are available below. Some books even have a bonus chapter or two! / Feel free to download and use with your students! They are FREE to you! IF you like the book(s), you may later wish to purchase the entire book.
Please feel free to check out WorldStrides' Summer Immersion Programs for Spanish teachers. Tom serves as the director for the three summer programs. Up to six hours of graduate credits in Spanish available!