Piyadassi, T. (1979). Buddhist meditation: The way to inner calm and clarity : being an expanded version of the fifteenth lecture under the Dona Alpina Ratanayake Trust, delivered at the University of Colombo, Sri Lanka (Ceylon) on 22nd December 2522/1978. [Piyadassi Thera].

Piyadassi, Thera. Buddhist Meditation: The Way to Inner Calm and Clarity : Being an Expanded Version of the Fifteenth Lecture Under the Dona Alpina Ratanayake Trust, Delivered at the University of Colombo, Sri Lanka (Ceylon) on 22nd December 2522/1978. [Colombo]: [Piyadassi Thera], 1979.

Piyadassi, Thera. Buddhist Meditation: The Way to Inner Calm and Clarity : Being an Expanded Version of the Fifteenth Lecture Under the Dona Alpina Ratanayake Trust, Delivered at the University of Colombo, Sri Lanka (Ceylon) on 22nd December 2522/1978. [Piyadassi Thera], 1979.