Charoenkwan Prakthong. 2002. The development of a cartoon book on "When the earth is dying" for prathomsuksa six students. Field of Study Environmental Education, Mahidol University;

Charoenkwan Prakthong. The development of a cartoon book on "When the earth is dying" for prathomsuksa six students. . Bangkok:Mahidol University, 2002.

Charoenkwan Prakthong. (2002) The development of a cartoon book on "When the earth is dying" for prathomsuksa six students . Mahidol University/Bangkok.