Puttitorn Saengrungruang. 2002. Optimal conditions for producing biogas from agricultural waste integrated aerobic and anaerobic digestion. Field of Study Appropriate Technology for Resources and Environmental Development, Mahidol University;

Puttitorn Saengrungruang. Optimal conditions for producing biogas from agricultural waste integrated aerobic and anaerobic digestion. . Bangkok:Mahidol University, 2002.

Puttitorn Saengrungruang. (2002) Optimal conditions for producing biogas from agricultural waste integrated aerobic and anaerobic digestion . Mahidol University/Bangkok.