Laihad และ Ferdinand Johanis. (1993) An assessment of supervision of health volunteers in primary heath care promotion in Muang district, Nakhon Pathom Province. Mahidol University,:ม.ป.ท.Laihad และ Ferdinand Johanis. 1993. An assessment of supervision of health volunteers in primary heath care promotion in Muang district, Nakhon Pathom Province. ม.ป.ท.:Mahidol University,;Laihad และ Ferdinand Johanis. An assessment of supervision of health volunteers in primary heath care promotion in Muang district, Nakhon Pathom Province. ม.ป.ท.:Mahidol University, 1993. Print.