The Perfection of renunciation (Nekkhamma-p⁻aram⁻i) ; The perfection of wisdom (Paññ⁻a-p⁻aram⁻i) ; The perfection of effort (Viriya-p⁻aram⁻i) ; The perfection of patience (Khanti-p⁻aram⁻i). Published by Sayagyi U Ba Khin Memorial Trust in 1987. Publication and catalogue information, links to buy online and reader comments.