Since then, I've read the following books which I can recommend to you:
Encyclopedia of Indian Cinema by Ashish Rajadhyaksha, Paul Willemen (2005)
Library Journal: >> contains entries on directors, stars, producers, writers, and composers and lists birth and death dates, background information, and filmography. A chronological listing of films from 1912 onwards--complete with cast, credits, and plot synopses--is also provided (...). << Unfortunately, it hasn't been updated since 1995.
Amazon.com (current price: $26.40)
Amazon.de (EUR 37,50)
Bollywood: A Guidebook to Popular Hindi Cinema by Tejaswini Ganti (2004)