APA
Ministry of State for Health Sri Lanka, . (1991). National Health Development Plan 1991. Colombo: Ministry of State for Health Sri Lanka.
Chicago
Ministry of State for Health Sri Lanka, . 1991. National Health Development Plan 1991. Colombo: Ministry of State for Health Sri Lanka.
Harvard
Ministry of State for Health Sri Lanka, . (1991). National Health Development Plan 1991. Colombo: Ministry of State for Health Sri Lanka.
MLA
Ministry of State for Health Sri Lanka, . National Health Development Plan 1991. Colombo: Ministry of State for Health Sri Lanka. 1991.