kohavi
Mishra And Chandrasekaran
follow the video lectures & book written by klp Mishra http://nptel.iitm.ac.in/courses/106106049/
name:Theory of Computer Science subject: Automata,languages and Computation Writer: K.L.P. Mishra,N.Chandrasekaran Rs:225.00
sorry sudipta price is not 225 its even cheaper. It costs 150 only