Sri Lanka. Ministry of Environment and Parliamentary Affairs & Sri Lanka. Madhyama Parisara Adhikāriya. (1990). Sobā: Environmental publication. Ministry of Environment and Parliamentary Affairs : Central Environmental Authority.
Chicago-referens (17:e uppl.)Sri Lanka. Ministry of Environment and Parliamentary Affairs och Sri Lanka. Madhyama Parisara Adhikāriya. Sobā: Environmental Publication. Colombo: Ministry of Environment and Parliamentary Affairs : Central Environmental Authority, 1990.
MLA-referens (8:e uppl.)Sri Lanka. Ministry of Environment and Parliamentary Affairs och Sri Lanka. Madhyama Parisara Adhikāriya. Sobā: Environmental Publication. Ministry of Environment and Parliamentary Affairs : Central Environmental Authority, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.