In order to work on the No Dual perspective of our reality and identity I recommend you access the following information about the master Sri Ramana Maharshi:
Conversations with Sri Ramana Maharshi 1 and 2
Happiness and the art of being – Sri Ramana Maharshi
Spiritual teachings – Sri Ramana Maharshi
Before Consciousness with Sri Nisargadatta Maharaj
Teacher Sri Ramana Maharshi