PONGUDOM Maen. (1979). Apologetic and missionary proclamation: exemplified by American Presbyterian missionaries to Thailand (1828-1978), early church apologists: Justin Martyr, Clement of Alexandria and Origen, and the Venerable Buddhadasa Bhikkhu, a Thai Buddhist monk-apologist. PhD. University of Utago.

Consultable at the EFEO Chiang Mai Library: https://koha.bulac.fr/cgi-bin/koha/opac-detail.pl?biblionumber=937649