Waraporn Putalun. 1993. Studies on volatile oil and piperine contents in pepper cultivated in Thailand. Graduate School, Chulalongkorn University;
Waraporn Putalun. (1993) Studies on volatile oil and piperine contents in pepper cultivated in Thailand . Chulalongkorn University/Bangkok.
Waraporn Putalun. Studies on volatile oil and piperine contents in pepper cultivated in Thailand. . Bangkok:Chulalongkorn University, 1993.
Waraporn Putalun. (1993) Studies on volatile oil and piperine contents in pepper cultivated in Thailand . Chulalongkorn University/Bangkok.