Srimad Bhagavad Gita
"Gita, the celestial song, is the essence of eternal wisdom. It is neither a teaching nor a preaching. It is a revelation from the Supreme to the spark. It deals with different stages of the eternal journey that begins from turmoil and ends with the withering away of the ego." (From the Introduction.) This is the most recently revised English translation as revealed by Swami Sri Atmananda.