Supattra Somapa. 1994. Serum melatonin levels in human subjects from the Northeastern and central parts of Thailand. Faculty of Graduate studies, Mahidol University;
Supattra Somapa. (1994) Serum melatonin levels in human subjects from the Northeastern and central parts of Thailand . Mahidol University/Bangkok.
Supattra Somapa. Serum melatonin levels in human subjects from the Northeastern and central parts of Thailand. . Bangkok:Mahidol University, 1994.
Supattra Somapa. (1994) Serum melatonin levels in human subjects from the Northeastern and central parts of Thailand . Mahidol University/Bangkok.