The only book on Annual Horoscope (revised second edition) you need to understand and use this predictive technique. MS Mehta has written fourth book in Vedic Astrology. The others "Planets and Travel Abroad', "Ashtakvarga' and "Analysing Horoscopes through Modern Techniques". All his books have run into second or third editions.
The book teaches the subject from the basic level with over 60 case studies. Many subtle predictive methods have been given which most astrologers do not even know. Numerous horoscopes to illustrate principles.