Rating: - Great starter book for AC's
Of the two major "textbooks" on ACing, this is the best one to start with. It gives enough information to initiate you into what is expected of all members of the camera crew, but is not overwhelming with technical info (not that you are not going to want that info someday, but if you are new, it can be confusing and even discouraging.) After this book, get David Elkin's Camera Assistant's Manual, which goes into much further detail. As you work with different cameras, download the manuals from the panavision/arri/aaton/etc websites so you can feel comfortable with the differences in individual cameras. Lastly, get a used copy of the very expensive American Cinematographer Manual for all the technical bits in one handy portable reference book. This, and tons of set experience, is probably all you need (and keep in mind some of the greatest cinematographers who ever lived worked without any of these aids). Rely on your eye!

Camera Assistant, The: A Complete Professional Handbook