The Nisargadatta Gita by Pradeep Apte. From the intro:
I came across a book ‘I Am That’ based on the talks of Sri Nisargadatta Maharaj. As I began going through it, I just couldn’t put it down, ‘This is dynamite!’ that’s the immediate feeling I had. I Then began preparing the text of ‘The Nisargadatta Gita’. In my life, so far, I had never met a living Guru, is my mere reading or studying of books of the teachings of all these great men of no avail? This last doubt was removed while I was editing the script of ‘I am Unborn’ where Sri Nisargadatta Maharaj answered this very question