ปภากโร (ศรีวัฒนปภา) พ. “AN ANALYSIS OF THE PRACTICAL BREATHING MEDITATION TEACHING BY BUDDHADASA BHIKKHU”. Journal of MCU Nakhondhat, vol. 6, no. 5, July 2019, pp. 2194-12, https://so03.tci-thaijo.org/index.php/JMND/article/view/192345.