"Prasithiphol khong nuai ngan prachasamphan kluantee nai karn hai kwamroo lae tasanakati dan karn anurak sappayakorn pamai kae prachachon nai
mooban changwat Chiang Mai" [Effectiveness of the public relations mobile units in providing information on forest resource conservation to villagers in Chiang Mai], master's thesis abstracts 1989, Chulalongkorn University.