K. Sreekantan Nair และ Siripen Supakankunti. (1997) A study on possible features of potential health insurance schemes for the urban informal sector in Delhi. Chulalongkorn University:ม.ป.ท.K. Sreekantan Nair และ Siripen Supakankunti. 1997. A study on possible features of potential health insurance schemes for the urban informal sector in Delhi. ม.ป.ท.:Chulalongkorn University;K. Sreekantan Nair และ Siripen Supakankunti. A study on possible features of potential health insurance schemes for the urban informal sector in Delhi. ม.ป.ท.:Chulalongkorn University, 1997. Print.