References – AN 3.55: Nibbāna 
Readings from The Island by Ajahn Pasanno and Ajahn Amaro, Chapter 1, pp. 30-35. Read by Ajahn Amaro:
Nyanatiloka Bhikkhu, “Nibbāna,” Buddhist Dictionary, p. 105.
The Mind Like Fire Unbound by Ajahn Ṭhānissaro, p. 2.
Suttas: MN 26.13; SN 38.1; AN 10.60; Ud 3.10; AN 3.55; AN 6.55; SN 43.1-44.
Vinaya: Mahāvagga 1.5 (also occurs at SN 6.1 and MN 26.19).
Readings from The Island [2025], Session 3
Readings from The Island by Ajahn Pasanno and Ajahn Amaro, Chapter 13, pp. 226-230. Read by Ajahn Pasanno:
Suttas: Ud 5.5; AN 3.55; MN 26.19; Iti 54 & 55; MN 107.3-11; MN 73.14.