Karan Siripanich. 2004. Knowledge and attitude of swine farmers towards environmental management system : ISO 14001 in Ratchaburi province. Field of Study Environmental Education, Mahidol University;
Karan Siripanich. (2004) Knowledge and attitude of swine farmers towards environmental management system : ISO 14001 in Ratchaburi province . Mahidol University/Bangkok.
Karan Siripanich. Knowledge and attitude of swine farmers towards environmental management system : ISO 14001 in Ratchaburi province. . Bangkok:Mahidol University, 2004.
Karan Siripanich. (2004) Knowledge and attitude of swine farmers towards environmental management system : ISO 14001 in Ratchaburi province . Mahidol University/Bangkok.