We (Sri Vishnu Chitta Shri) have published a detailed book on thiruppavai ( 3 volumes for 30 thiruppavai poems). It is called as 'Poo maalai soodi koduthaval paamalai' written by Shri Raghavasimhan. A scholar in sanskrit and Tamil and a very senior learned person. Other books that have been written are Naaman aayiram etru nindra Narayanan and Alli Maa malar mangai. I have been blessed to serve the Lord through these books. The book can be got from Giri Trading. If any one needs any books, I can help in sending them over, I think each book (all volumes incl) cost Rs 600 or 700. I do have the internet rights for all these books and hopefully the Lord helps me get these books online too as soon as possible, if any one can help in accomplishing that, I would be grateful to them.