Thanaphon Cheungsirakulvit และ Suchitra Chongstitvatana. (2012) Buddhadasa's poetry and the contemplation on emptiness. Chulalongkorn University:ม.ป.ท.Thanaphon Cheungsirakulvit และ Suchitra Chongstitvatana. 2012. Buddhadasa's poetry and the contemplation on emptiness. ม.ป.ท.:Chulalongkorn University;Thanaphon Cheungsirakulvit และ Suchitra Chongstitvatana. Buddhadasa's poetry and the contemplation on emptiness. ม.ป.ท.:Chulalongkorn University, 2012. Print.