Supitcha Sumretphol และ Prathurng Hongsranagon. (2015) Knowledge and attitude toward the selection of health insurance type after retirement in Ratchaburi province Thailand. Chulalongkorn University:ม.ป.ท.Supitcha Sumretphol และ Prathurng Hongsranagon. 2015. Knowledge and attitude toward the selection of health insurance type after retirement in Ratchaburi province Thailand. ม.ป.ท.:Chulalongkorn University;Supitcha Sumretphol และ Prathurng Hongsranagon. Knowledge and attitude toward the selection of health insurance type after retirement in Ratchaburi province Thailand. ม.ป.ท.:Chulalongkorn University, 2015. Print.