Orapin Chaipayom และ Sauwakon Ratanawijitrasin. (2002) An intervention to improve self-care practices for patients with hypertension in Pasak sub-district, Chiang Rai province : a proposal and reliability test of questionaire. Chulalongkorn University:ม.ป.ท.Orapin Chaipayom และ Sauwakon Ratanawijitrasin. 2002. An intervention to improve self-care practices for patients with hypertension in Pasak sub-district, Chiang Rai province : a proposal and reliability test of questionaire. ม.ป.ท.:Chulalongkorn University;Orapin Chaipayom และ Sauwakon Ratanawijitrasin. An intervention to improve self-care practices for patients with hypertension in Pasak sub-district, Chiang Rai province : a proposal and reliability test of questionaire. ม.ป.ท.:Chulalongkorn University, 2002. Print.