References
Bhadantacariya Buddhaghaghosa. the Path of Purification (Visuddhimagga). Tr.by BhikkhuNanamoli,
Singapore Buddhist Meditation Centre.
Dighanikaya Patikavagga. 11/ 431/347 (MCU).Narada
The Dhammapada. Sri Lanka: BPS, 1978
Phra Prayudh Puyutto. Buddhadhamma: Natural Laws and Values for life. Tr. By Grant A. Olson.