References – Iti 43: Unborn 
Readings by Ajahn Amaro:
The Island by Ajahn Pasanno and Ajahn Amaro, Chapter 9, pp. 158-165:
Suttas: Ud 8.1; Ud 8.3, Iti 43; Ud 8.4; Milindapañha 323; Milindapañha 326-328; SN 1.1.
The Magic of the Mind by Bhikkhu Ñāṇananda, pp. 58-60.
Ācariya Nāgārjuna, Mūlamadyamaka-kārika, Ch 25.
Ajahn Chah, personal letter to Ajahn Sumedho.
“What is Contemplation?”, Collected Teachings of Ajahn Chah, pp. 475-479.
Sutta: Ud 1.10: Bāhiya, quoted in The Island by Ajahn Pasanno and Ajahn Amaro, p. 65.