Surely Corinda's 13 Steps would also suffice for mentalism? Im not a mentalist but ive heard they are the best place to start.
Bob Cassidy's Fundamentals (note the title) teaches you how to be a mentalist. Corinda's 13 Steps is more like a textbook. It's a LOT of information to have thrown at you when you don't even know how to present like a mentalist. I would actually recommend Fundamentals, then Practical Mental Magic, then Corinda.